Machines in a Category

In the mid 70s, Anderson, Arbib, and Manes did some work on "Machines in a Category" (SIAM, 1976) A lot of this was in support of work in using category theory in control theory. Can anyone provide information about the state of this research or a bibliography of this work in unifying control theory and computation? Best regards, steve ---- D. E. (Steve) Stevenson, Department of Computer Science, Clemson At the genetic level, race does not exist. Studies of human DNA have found that there is far more genetic variability between individuals within any "given" group than between two such groups. Dawn Stover, <em> New York Times