ARTICLE Sheikhi_PRL_2015/IDIAP Combining dynamic head pose-gaze mapping with the robot conversational state for attention recognition in human-robot interactions Sheikhi, Samira Odobez, Jean-Marc EXTERNAL http://publications.idiap.ch/attachments/papers/2015/Sheikhi_PRL_2015.pdf PUBLIC Pattern Recognition Letters 66 81-90 2015