K. K. Ramakrishnan and Peter Newman, "Integration of rate and credit
schemes for ATM flow control," IEEE Network. Mag. Mar. 1995 pp 49-56.
http://tesuji/ieee_network95.ps
which is mostly just an explanation of the ATM Forum's various
justifications for choosing rate over credit, and why that doesn't
necessarily mean that credit can't be used with appropriate
translations of rates...definately an optional read
of greater interest (or greater potential distraction) there is a
another thread of work referenced, (which also served to remind me
that I have never read Parekh's thesis)