David Griol Lluìs F. Hurtado Encarna Segarra Emilio Sanchis A Two Phases Statistical Approach for Dialog Management. 60-71 2008 PIT http://dx.doi.org/10.1007/978-3-540-69369-7_8 conf/pit/2008 db/conf/pit/pit2008.html#GriolHSS08