Provided:
A Survey of Wormhole Routing Techniques in Direct Networks,
L. M. Ni and P. McKinley, February, p62-76, IEEE Computing,
1993.
Design and Implementation of an Interconnection Network for the
AP1000,
T. Horie, H. Ishihata and M. Ikesaka,
Algorithms, Software, Architecture Information Processing'92,
vol I,
p555-561, Elsevier, 1992.
Good, but long:
Parallel Computer Architecture A Hardware / Software Approach, D. Culler, J. P. Singh and A. Gupta, (Pre-production draft 9/4/97), Chapter 10,
http://now.cs.berkeley.edu/~culler/book.alpha/
Network and Processor Architecture for Message-Driven Computers, W. J. Dally, VLSI and Parallel Computation, Chapter 3, Morgan Kaufmann, 1990.