Vladimiro Sassone Mogens Nielsen Glynn Winskel Models for Concurrency: Towards a Classification. 297-348 1996 170 Theor. Comput. Sci. 1-2 db/journals/tcs/tcs170.html#SassoneNW96 http://dx.doi.org/10.1016/S0304-3975(96)80710-9