Van Leeuwen, Edwin J. C. Comparative Cognitive Anthropology, MPI for Psycholinguistics, Max Planck Society;
Van Leeuwen, E. J. C. (2011). Grooming hand-clasping in chimpanzees: Social culture?. Talk presented at the Human Behaviour and Evolution Conference. Montpellier, France. 2011-06-29 - 2011-07-03.