Investigating Clarification Strategies in a Hybrid POMDP Dialog Manager Sebastian Varges author Silvia Quarteroni author Giuseppe Riccardi author Alexei Ivanov author 2010-09 text Proceedings of the SIGDIAL 2010 Conference Yasuhiro Katagiri editor Mikio Nakano editor Association for Computational Linguistics Tokyo, Japan conference publication varges-etal-2010-investigating https://aclanthology.org/W10-4337/ 2010-09 213 216