\input zb-basic \input zb-ioport \iteman{io-port 70225970} \itemau{Schreiber, Gerlinde} \itemti{Operational semantics and a distributed implementation of CSP} \itemso{MFPS, 444-454 (1987).} \itemcc{} \itemut{} \itemli{doi:10.1007/3-540-19020-1\_24} \end