Federico Calzolari Eva Sassolini Manuela Sassi Sebastiana Cucurullo Eugenio Picchi Francesca Bertagna Alessandro Enea Monica Monachini Claudia Soria Nicoletta Calzolari http://arxiv.org/abs/cs/0611148 2006 CoRR abs/cs/0611148 db/journals/corr/corr0611.html#abs-cs-0611148