@workingPaper{BusemannDeclerckDiagneDiniKleinSchmeier_1997,
title={Natural language dialogue service for appointment scheduling agents},
author={Busemann, Stephan and Declerck, Thierry and Diagne, Abdel Kader and Dini, Luca and Klein, Judith and Schmeier, Sven},
doi={http://dx.doi.org/10.22028/D291-24940},
year={1997}
}