1. A. Weiss, T. Scherndl, M. Tscheligi, A. Billard, Evaluating the ICRA 2008 HRI Challenge. In: ACM/IEEE International Conference on Human-Robot Interaction, San Diego, USA, (ACM Press, New York, 2009), 261
2. G. O. Deak, I. Fasel, J. Movellan, The Emergence of Shared Attention: Using Robots to Test Developmental Theories. In: International Workshop on Epigenetic Robotics, Lund, Sweden, (Lund University Cognitive Studies, 2001), 95
3. T. Striano, V. M. Reid, S. Hoehl, Neural Mechanisms of Joint Attention in Infancy. The Euro. J. Neurosci, 23, 2819 (2006)
4. M. L. Patterson, Nonverbal Behavior: A Functional Perspective, (Springer-Verlag, New York, 1983)
5. E. T. Hall, The Hidden Dimension: Man’s Use of Space in Public and Private, (The Bodley Head Ltd., London, 1966)