Ugo Galassi Attilio Giordana Lorenza Saitta Structured Hidden Markov Model: A General Framework for Modeling Complex Sequences. 290-301 2007 conf/aiia/2007 AI*IA http://dx.doi.org/10.1007/978-3-540-74782-6_26 db/conf/aiia/aiia2007.html#GalassiGS07