Stephan Busemann Thierry Declerck Abdel Kader Diagne Luca Dini Judith Klein Sven Schmeier Natural Language Dialogue Service for Appointment Scheduling Agents. 25-32 1997 ANLP http://acl.ldc.upenn.edu/A/A97/A97-1006.pdf db/conf/anlp/anlp1997.html#BusemannDDDKS97