Lode Vanacken Erwin Cuppens Tim Clerckx Karin Coninx Extending a Dialog Model with Contextual Knowledge. 28-41 2007 conf/tamodia/2007 TAMODIA http://dx.doi.org/10.1007/978-3-540-77222-4_4 db/conf/tamodia/tamodia2007.html#VanackenCCC07