1. Mehrabian A (2009) Nonverbal communication. Aldine Transaction, Piscataway, pp 1–11, first printed in 1972
2. Erden MS, Tapus A (2010) Postural expressions of emotions in a humanoid robot for assistive applications. Poster paper in workshop on learning for human–robot interaction modeling under the conference of robotics science and systems-RSS 2010, 27–30 June, Zaragoza, Spain
3. Nomura T, Nakao A (2010) Comparison on identification of affective body motions by robots between elder people and university students: a case study in Japan. Int J Soc Robot 2:147–157
4. Zecca M, Endo N, Momoki S, Itoh K, Takanishi A (2008) Design of humanoid robot KOBIAN—preliminary analysis of facial and whole body emotion expression capabilities. In: Proc of the 8th IEEE-RAS int conf on humanoid robot, vol 1–3, Daejeon, Korea, 1–3 Dec, pp 487–492
5. Li J, Chignell M (2010) Communication of emotion in social robots through simple head and arm movements. Int J Soc Robot. doi: 10.1007/s12369-010-0071-x . Published Online 4 September 2010.