Emmanuel Beffara François Maurel Concurrent Nets: A Study of Prefixing in Process Calculi. 67-86 2005 128 Electr. Notes Theor. Comput. Sci. 2 http://dx.doi.org/10.1016/j.entcs.2004.11.029 db/journals/entcs/entcs128.html#BeffaraM05