Filippo Bonchi Maria Grazia Buscemi Vincenzo Ciancia Fabio Gadducci A Category of Explicit Fusions. 544-562 2008 Concurrency, Graphs and Models http://dx.doi.org/10.1007/978-3-540-68679-8_34 conf/birthday/2008montanari db/conf/birthday/montanari2008.html#BonchiBCG08