V. Gonzalez Pacheco, M. Malfaz, J.C. Castillo, A. Castro-Gonzalez, F. Alonso, M.A. Salichs. How Much Should a Robot Trust the User Feedback? Analyzing the Impact of Verbal Answers in Active Learning. 8th International Conference on Social Robotics. , ISBN: , pages: - , . 2016-11-01, Kansas City, USA. 2016.