PPT Slide
Distributed Operating Systems Distributed Systems, Concepts and Design
Andrew Tanenbaum Coulouris, Dollimore and Kindberg
Prentice Hall, 1995. Addison-Wesley, 1994
Clock Synchronization in the Presence of Omission and Performance Faults, and Processor Joins.
F. Cristian, H. Aghili, R. Strong
In Global States and Time in Distributed Systems, Computer Society Press,