On the Word Problem for SP{Sigma Pi}-Categories, and the Properties of Two-Way Communication.

J. Robin B. Cockett Luigi Santocanale On the Word Problem for SP{Sigma Pi}-Categories, and the Properties of Two-Way Communication. 194-208 2009 CSL http://dx.doi.org/10.1007/978-3-642-04027-6_16 conf/csl/2009 db/conf/csl/csl2009.html#CockettS09