Robert J. van Vark J. P. M. de Vreught Léon J. M. Rothkrantz Classification of Public Transport Information Dialogues Using an Information-Based Coding Scheme. 55-69 1996 conf/ecai/1996w1 ECAI Workshop on Dialogue Processing in Spoken Language Systems db/conf/ecai/ecai1996w1.html#VarkVR96