Roberto Bruni Vladimiro Sassone Models of Computation: A Tribute to Ugo Montanari's Vision. 503-509 2008 Concurrency, Graphs and Models http://dx.doi.org/10.1007/978-3-540-68679-8_31 conf/birthday/2008montanari db/conf/birthday/montanari2008.html#BruniS08