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Date: Sun, 29 Jun 1997 20:49:19 -0400
From: Michael Barr <barr@triples.math.mcgill.ca>

Not that I am blowing my own horn (but why not), you will find something
about comma categories in Barr & Wells, Category Theory for Computing
Science.  But no, I know of no other research along those lines.

Michael Barr