Terminological Variants for Document Selection and Question/Answer Matching Olivier Ferret author Brigitte Grau author Martine Hurault-Plantet author Gabriel Illouz author Christian Jacquemin author 2001 text Proceedings of the ACL 2001 Workshop on Open-Domain Question Answering conference publication ferret-etal-2001-terminological https://aclanthology.org/W01-1207/ 2001