One older paper specifically focused on ccr is available. Much
of the text from it is scattered around this site.
Another paper raves more generally but uses ccr for examples:
Ackley, D. H. (1996).
- ccr: A Network of Worlds for
Research. In Artificial Life V, MIT Press. PDF (500K)
- Ackley, D. H. (2000).
- Real Artificial
Life: Where we may be. To appear in Artificial Life VII