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Browsing publications by Dr Paul Ezhilchelvan.

Newcastle AuthorsTitleYearFull text
Dr Karen Elliott
Kumaran Coopamootoo
Edward Curran
Dr Paul Ezhilchelvan
Dave Horsfall
et al.
Know Your Customer: Balancing Innovation and Regulation for Financial Inclusion2022
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
On the benefits and costs of offloading among cooperating clouds2021
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Modeling the Gradual Degradation of Eventually-Consistent Distributed Graph Databases2020
Jack Waudby
Dr Paul Ezhilchelvan
Professor Jim Webber
Emeritus Professor Isi Mitrani
Preserving Reciprocal Consistency in Distributed Graph Databases2020
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
A Queuing Model of a Stream-Processing Server2019
Edward Curran
Dr Paul Ezhilchelvan
Decision Making with Verifiable Credentials2019
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Jack Waudby
Professor Jim Webber
Design and Evaluation of an Edge Concurrency Control Protocol for Distributed Graph Databases2019
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Multi-class resource sharing with batch arrivals2019
Dr Paul Ezhilchelvan
Amjad Aldweesh
Non-blocking two-phase commit using blockchain2019
Ibrahim El-sanosi
Dr Paul Ezhilchelvan
Improving ZooKeeper Atomic Broadcast Performance When a Server Quorum Never Crashes2018
Dr Paul Ezhilchelvan
Amjad Aldweesh
Professor Aad van Moorsel
Non-Blocking Two Phase Commit Using Blockchain2018
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Professor Jim Webber
On the degradation of distributed graph databases with eventual consistency2018
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Professor Jim Webber
On the degradation of distributed graph databases with eventual consistency2018
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Evaluating the Probability of Malicious Co-residency in Public Clouds2017
Ibrahim El-sanosi
Dr Paul Ezhilchelvan
Improving ZooKeeper Atomic Broadcast Performance by Coin Tossing2017
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Multi-class Resource Sharing with Batch Arrivals and Complete Blocking2017
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Optimal provisioning of servers for hosting services of multiple types2017
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Optimal provision of multiple service types2016
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Static and Dynamic Hosting of Cloud Servers2015
Ryan Emerson
Dr Paul Ezhilchelvan
A Non-Blocking Atomic-Multicast Service for Scalable In-memory Transaction Systems2014
Ryan Emerson
Dr Paul Ezhilchelvan
An Atomic-Multicast Service for Scalable In-Memory Transaction Systems2014
Abdulaziz Alabdulhafez
Dr Paul Ezhilchelvan
Experimenting on virtual machines co-residency in the cloud: A Comparative Study of Available Test Beds2014
Abdallah Abouzamazem
Dr Paul Ezhilchelvan
Efficient Inter-Cloud Replication for High-Availability Services2013
Kanat Aidarov
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Energy-aware Management of Customer Streams2013
Visalakshmi Suresh
Dr Paul Ezhilchelvan
Professor Paul Watson
Scalable and responsive event processing in the cloud2013
Dr Khaled Alekeish
Dr Paul Ezhilchelvan
Consensus in Sparse, Mobile Ad Hoc Networks2012
Kanat Aidarov
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Energy-aware management of customer streams2012
Kanat Aidarov
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Energy-aware management of customer streams2012
Dr Dylan Clarke
Dr Paul Ezhilchelvan
FORTRESS: Adding Intrusion-Resilience to Primary-Backup Server Systems2012
Visalakshmi Suresh
Dr Paul Ezhilchelvan
Professor Paul Watson
Scalable and Responsive Event Processing in the Cloud2012
Visalakshmi Suresh
Dr Paul Ezhilchelvan
Professor Paul Watson
Cuong Pham
Dan Jackson
et al.
Distributed event processing for activity recognition2011
Visalakshmi Suresh
Dr Paul Ezhilchelvan
Professor Paul Watson
Cuong Pham
Dan Jackson
et al.
Distributed Event Processing For Activity Recognition2011
Dr Paul Ezhilchelvan
Near Certain Multicast Delivery Guarantees Amidst Perturbations in Computer Clusters2011
Visalakshmi Suresh
Dr Paul Ezhilchelvan
Professor Paul Watson
Scalable and Responsive Event Processing in the Cloud2011
Dr Dylan Clarke
Dr Paul Ezhilchelvan
Assessing the Attack Resilience Capabilities of a Fortified Primary Backup System2010
Dr Dylan Clarke
Dr Paul Ezhilchelvan
Assessing the attack resilience capabilities of a fortified primary-backup system2010
Dr Khaled Alekeish
Dr Paul Ezhilchelvan
Consensus in Sparse, Mobile Ad-hoc Networks2010
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Learning from the Past for Resolving Dilemmas of Asynchrony2010
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Encounter-Based Message Propagation in Mobile Ad-Hoc Networks2009
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Learning from the Past for Resolving Dilemmas of Asynchrony2009
Dr Paul Ezhilchelvan
Dr Dylan Clarke
Emeritus Professor Isi Mitrani
Emeritus Professor Santosh Shrivastava
Proactive Fortification of Fault-Tolerant Services2009
Dr Paul Ezhilchelvan
Dr Dylan Clarke
Emeritus Professor Isi Mitrani
Emeritus Professor Santosh Shrivastava
Sustaining Intrusion-Tolerance by Proactive Replacement2009
David Cooper
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
A Real World Evaluation of Encounter Gossip2008
Dr Paul Ezhilchelvan
Responsive Fault-Tolerant Computing in the Era of Terascale Integration2008
Dr Paul Ezhilchelvan
Responsive fault-tolerant computing in the era of terascale integration - State of art report2008
Dr Paul Ezhilchelvan
Responsive Fault-Tolerant Computing in the era of Terascale Integration – State of Art Report2008
Giovanna Ferrari
Dr Paul Ezhilchelvan
A Comparative Evaluation of EJB Implementation Methods2007
Mohammad Alsaeed
Qurat-ul-Ain Inayat
Dr Neil Speirs
Dr Paul Ezhilchelvan
Examining the Performance Benefits of Fail-Signal Approach using a Network Emulator2007
Dr Paul Ezhilchelvan
Welcome to HotP2P '072007
Dr Paul Ezhilchelvan
Workshop on Dependable Application Support for Self-organizing Networks (DASSON 2007)2007
Qurat-ul-Ain Inayat
Dr Paul Ezhilchelvan
A performance study on the signal-on-fail approach to imposing total order in the streets of Byzantium2006
Qurat-ul-Ain Inayat
Dr Paul Ezhilchelvan
A Performance Study on the Signal-On-Fail Approach to Imposing Total Order in the Streets of Byzantium2006
Qurat-ul-Ain Inayat
Dr Paul Ezhilchelvan
A Performance Study on the Signal-On-Fail Approach to Imposing Total Order in the Streets of Byzantium2006
Antonio Di Ferdinando
Dr Paul Ezhilchelvan
A QoS-negotiable middleware system for reliably multicasting messages of arbitrary size2006
Giovanna Ferrari
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Performance Modeling and Evaluation of E-Business Systems2006
Giovanna Ferrari
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Performance Modelling and Evaluation of E-Business Systems2006
Francois Bonnet
Dr Paul Ezhilchelvan
Einar Vollset
Quiescent Consensus in Mobile Ad-hoc Networks using Eventually Storage-Free Broadcasts2006
Francois Bonnet
Dr Paul Ezhilchelvan
Einar Vollset
Quiescent consensus in mobile ad-hoc networks using eventually storage-free broadcasts2006
David Cooper
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
A Family of Encounter-Based Broadcast Protocols for Mobile Ad-hoc Networks2005
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A Family of Trusted Third Party based Fair-Exchange Protocols2005
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A family of trusted third party based fair-exchange protocols2005
Dr Paul Ezhilchelvan
Building responsive TMR-based servers in presence of timing constraints2005
Dr Paul Ezhilchelvan
Building Responsive TMR-Based Servers in Presence of Timing Constraints2005
Einar Vollset
Dr Paul Ezhilchelvan
Design and Performance-Study of Crash-Tolerant Protocols for Broadcasting and Reaching Consensus in MANETs2005
Einar Vollset
Dr Paul Ezhilchelvan
Design and Performance-Study of Crash-Tolerant Protocols for Broadcasting and Reaching Consensus in MANETs2005
Einar Vollset
Dr Paul Ezhilchelvan
Enabling Reliable Many-to-Many Communication in Ad-Hoc Pervasive Environments2005
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Einar Vollset
Optimization of Encounter Gossip Propagation in Mobile Ad-Hoc Networks2005
David Cooper
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Einar Vollset
Optimization of encounter gossip propagation in mobile ad-hoc networks2005
Francois Bonnet
Dr Paul Ezhilchelvan
Einar Vollset
Quiescent Consensus in Mobile Ad-hoc Networks using Eventually Storage-Free Broadcasts2005
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A model and a design approach to building QoS adaptive systems2004
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A Model and a Design Approach to Building QoS Adaptive Systems2004
Dr Paul Ezhilchelvan
Dr Neil Speirs
A Timeout-Based Message Ordering Protocol for a Lightweight Software Implementation of TMR Systems2004
Dr Paul Ezhilchelvan
Professor Roy Maxion
Against Attacks and Faults: an Autonomic Approach to Secure and Reliable Data Management2004
Giovanna Ferrari
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
An Approach to Adaptive Performance Tuning of Application Servers2004
Antonio Di Ferdinando
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Design and Evaluation of a QoS-Adaptive System for Reliable Multicasting2004
Antonio Di Ferdinando
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Design and Evaluation of a QoS-Adaptive System for Reliable Multicasting2004
Einar Vollset
Dr Paul Ezhilchelvan
Design and Evaluation of an Efficient Reliable Manycast protocol for Ad-hoc Networks2004
Einar Vollset
Dr Paul Ezhilchelvan
Enabling reliable many-to-many communication in ad-hoc pervasive environments2004
Dimane Mpoeleng
Dr Paul Ezhilchelvan
Dr Neil Speirs
From Crash Tolerance to Authenticated Byzantine Tolerance: a Structured Approach, the Cost and Benefits2004
David Cooper
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
High coverage broadcasting for mobile Ad Hoc networks2004
Dr Paul Ezhilchelvan
On the progress in fault-tolerant real-time computing2004
Einar Vollset
Dr Paul Ezhilchelvan
Scribble: An efficient reliable manycast protocol for ad-hoc networks2004
Einar Vollset
Dr Paul Ezhilchelvan
Scribble: an Efficient Reliable Manycast protocol for Ad-hoc Networks2004
Einar Vollset
Dr Paul Ezhilchelvan
A Survey of Reliable Broadcast Protocols for Mobile Ad-hoc Networks2003
Einar Vollset
Dr Paul Ezhilchelvan
An Efficient Reliable Broadcast protocol for Mobile Ad-hoc Networks2003
Dr Paul Ezhilchelvan
Douglas Palmer
An Optimal Atomic Broadcast Protocol and an Implementation Framework2003
Dimane Mpoeleng
Dr Paul Ezhilchelvan
Dr Neil Speirs
From crash tolerance to authenticated byzantine tolerance: a structured approach, the cost and benefits2003
David Cooper
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
High Coverage Multicasting for Mobile Ad-hoc Networks2003
Einar Vollset
David Ingham
Dr Paul Ezhilchelvan
JMS on Mobile Ad Hoc Networks2003
Einar Vollset
David Ingham
Dr Paul Ezhilchelvan
JMS on mobile ad hoc networks2003
Einar Vollset
David Ingham
Dr Paul Ezhilchelvan
JMS on Mobile Ad-hoc Networks2003
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Systematic Development of a Family of Fair Exchange Protocols2003
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Systematic Development of a Family of Fair Exchange Protocols2003
Dr Paul Ezhilchelvan
A Middleware Architecture for Intrusion- and Fault-Tolerant Service Replication2002
Dr Paul Ezhilchelvan
Dr Neil Speirs
A Two Tier Approach To Building Dependable Middleware Services2002
Dr Paul Ezhilchelvan
Brief announcement: Building responsive TMR-based servers in presence of timing constraints2002
Dr Paul Ezhilchelvan
Building Responsive TMR-Based Servers in the Presence of Timing Constraints2002
Dr Paul Ezhilchelvan
Professor Alexander Romanovsky
Concurrency in Dependable Computing2002
Daniel Owen
Dr Paul Ezhilchelvan
Verifiable Fault-Tolerant Transformation of a Real-Time Legacy System2002
Dr Paul Ezhilchelvan
Dr Graham Morgan
A Dependable Distributed Auction System: Architecture and an Implementation Framework2001
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Professor Mark Little
A Model and Architecture for Conducting Hierarchically Structured Auctions2001
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Professor Mark Little
A Model and Architecture for Conducting Hierarchically Structured Auctions2001
Dr Paul Ezhilchelvan
Building Responsive and Reliable Distributed Services: Models and Design Options2001
Professor Alexander Romanovsky
Dr Paul Ezhilchelvan
Conversations with fixed and potential participants2001
Dr Paul Ezhilchelvan
Mohammad Khayyambashi
Dr Graham Morgan
Douglas Palmer
Measuring the cost of scalability and reliability for Internet-based, server-centered applications2001
Dr Paul Ezhilchelvan
Randomized Multivalued Consensus2001
Dr Paul Ezhilchelvan
A Multicast Transport Protocol for Reliable Group Applications2000
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Advances in Distributed Systems: advanced distributed computing, from algorithms to systems2000
Dr Paul Ezhilchelvan
Building TMR-Based Reliable Servers Despite Bounded Input Lifetimes2000
Dr Graham Morgan
Dr Paul Ezhilchelvan
Issues in designing group invocation and management policies for using replica groups over the Internet2000
Dr Graham Morgan
Dr Paul Ezhilchelvan
Issues in designing group invocation and management policies for using replica groups over the Internet2000
Dr Graham Morgan
Dr Paul Ezhilchelvan
Policies for Using Replica Groups and their Effectiveness over the Internet2000
Dr Graham Morgan
Dr Paul Ezhilchelvan
Policies for using Replica Groups and their effectiveness over the Iternet2000
Dr Paul Ezhilchelvan
Randomized Multivalued Consensus2000
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
Professor John Fitzgerald
Safety Critical Distributed Systems: a State of Art Report2000
Dr Paul Ezhilchelvan
A Multicast Transport Protocol for Reliable Group Applications1999
Dr Paul Ezhilchelvan
A multicast transport protocol for reliable group applications1999
Dr Paul Ezhilchelvan
A Multicast Transport Protocol for Reliable Group Applications1999
Dr Graham Morgan
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Professor Mark Little
Design and Implementation of a CORBA Fault-Tolerant Object Group Service1999
Dr Paul Ezhilchelvan
Professor Alexander Romanovsky
Engineering Look-Ahead in Distributed Conversations1999
Professor Alexander Romanovsky
Dr Paul Ezhilchelvan
Engineering Look-ahead in Distributed Conversations1999
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Enhancing Replica Management Services to Cope with Group Failures1999
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Enhancing Replica Management Services to Tolerate Group Failures1999
Dr Paul Ezhilchelvan
An End-to-End Reliable Multicast Protocol Using Polling for Scalability1998
Dr Paul Ezhilchelvan
End-to-end reliable multicast protocol using polling for scaleability1998
Dr Paul Ezhilchelvan
PRMP: A Scaleable Polling-Based Reliable Multicast Protocol1998
Dr Paul Ezhilchelvan
Dr Neil Speirs
A Timeout Based Message Ordering Protocol for a Lightweight Software Implementation of TMR Systems1997
Dr Paul Ezhilchelvan
An End-to-End Reliable Multicast Protocol Using Polling for Scaleability1997
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Determining the Last Membership of a Process Group after a Total Failure1997
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Dr Neil Speirs
Implementing Fail-Silent Nodes for Distributed Systems1997
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Dr Neil Speirs
Implementing fail-silent nodes for distributed systems1996
Dr Paul Ezhilchelvan
Atomic Broadcast Using Time-Outs instead of Synchronised Time1995
Dr Paul Ezhilchelvan
Dr Neil Speirs
Authenticated Agreement Protocols without Explicit Clock Synchronisation1995
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Flow Control Schemes for a Fault-Tolerant Multicast Protocol1995
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Focused Fault Injection Testing of Software Implemented Fault Tolerance Mechanisms of Voltan TMR Nodes1995
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Newtop: A Fault-Tolerant Group Communication Protocol1995
Dr Paul Ezhilchelvan
Dr Neil Speirs
TMR Processing without Explicit Clock Synchronisation1995
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
NewTop: A Fault-Tolerant Group Communication Protocol1994
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
rel/REL: A Family of Reliable Multicast Protocols for Distributed Systems1994
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Dr Neil Speirs
Efficient Protocols for Fail-silent Nodes in Distributed Systems1993
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
NewTop: A Total Order Multicast Protocal Using Causal Blocks1993
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
rel/REL: A Family of Reliable Multicast Protocols for Distributed Real-time Systems1993
Dr Neil Speirs
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
The Design and Implementation of Voltan Fault-tolerant Nodes for Distributed Systems1993
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
The Design and Implementation of Voltan Fault-tolerant Nodes for Distributed Systems1993
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A Distributed Systems Architecture Supporting High Availability and Reliability1992
Dr Neil Speirs
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Efficient Schemes for Constructing Reliable Computing Nodes in Distributed Systems1992
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
Fail-Controlled Computer Architectures for Distributed Systems1992
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
Dr Alan Tully
Principle Features of the VOLTAN Family of Reliable Node Architectures for Distributed Systems1992
Dr Rogerio De Lemos
Dr Paul Ezhilchelvan
Agreement on the Group Membership in Synchronous Distributed Systems1991
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
Fail-controlled Computer Architectures for Distributed Systems1991
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
Dr Alan Tully
Principal Features of the Voltan Family of Reliable Node Architectures for Distributed Systems1991
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Emeritus Professor Santosh Shrivastava
A Performance Evaluation Study of Pipelined TMR Systems1990
Dr Paul Ezhilchelvan
Dr Rogerio De Lemos
A Robust Group Membership Algorithm for Distributed Real-Time Systems1990
Dr Paul Ezhilchelvan
Design and Development of Algorithms for Fault Tolerant Distributed Systems1990
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Dr Neil Speirs
Fail-controlled processor architectures for distributed systems1990
Emeritus Professor Santosh Shrivastava
Dr Paul Ezhilchelvan
Professor Mark Little
Understanding Component Failures and Replications in Distributed Systems1990
Dr Paul Ezhilchelvan
Emeritus Professor Isi Mitrani
Emeritus Professor Santosh Shrivastava
An Empirical Study of the Performance of Distributed Replicated Systems1989
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Dr Alan Tully
Constructing Replicated Systems Using Processors With Point to Point Communication Links1989
Dr Paul Ezhilchelvan
Design and Development of Algorithms For Fault Tolerant Distributed Systems [PhD thesis]1989
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
Dr Alan Tully
Constructing Replicated Systems using Processors with Point-to-Point Communication Links1988
Dr Paul Ezhilchelvan
With Less Malicious Byzantine Generals: Agreement Algorithms Under Value Faults1988
Dr Paul Ezhilchelvan
Early Stopping Algorithms for Distributed Agreement Under Fail-stop, Omission, and Timing Fault Types1987
Dr Paul Ezhilchelvan
Early Stopping Algorithms For Distributed Agreement Under Fail-stop, Omission, and Timing Fault Types1987
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A Characterisation of Faults in Systems1986
Dr Paul Ezhilchelvan
Emeritus Professor Santosh Shrivastava
A Characterization of Faults in Systems1985