Using Machine Learning to Explore Human Multimodal Clarification Strategies Verena Rieser author Oliver Lemon author 2006-07 text Proceedings of the COLING/ACL 2006 Main Conference Poster Sessions Association for Computational Linguistics Sydney, Australia conference publication rieser-lemon-2006-using https://aclanthology.org/P06-2085/ 2006-07 659 666