Research Sources:

Andrew Tridgell PhD Thesis
How RSYNC Works
Linux Versioning Layer
Indroduction to VAX/VMS Version 3.4
HP Open VMS Documentation
CVSNT Concurrent Versioning System 2.0.1b
Subversion
JavaXdelta Project
Jarsync Project
RProxy Project
MinGW
The GIMP Toolkit
GDiff Format Specification
XDelta for Windows
XDelta - Berkeley Research
Diff Algorithms

Others:

MekTek Solutions
Carlton University
Carleton Systems and Computer Engineering Dept.