Ugo Galassi Attilio Giordana Lorenza Saitta Structured Hidden Markov Models: A General Tool for Modeling Agent Behaviors. 273-292 2008 Soft Computing Applications in Business http://dx.doi.org/10.1007/978-3-540-79005-1_15 series/sfsc/2008-230 db/series/sfsc/sfsc230.html#GalassiGS08