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Author (up) Title Year Publication Serial Volume Pages
Flack, J.C.; Jeannotte, L.A.; de Waal, F.B.M. Play signaling and the perception of social rules by juvenile chimpanzees (Pan troglodytes) 2004 Journal of comparative psychology (Washington, D.C. : 1983) 172 118 149-159
Singer, R.A.; Klein, E.D.; Zentall, T.R. Use of a single-code/default strategy by pigeons to acquire duration sample discriminations 2006 Learning & behavior : a Psychonomic Society publication 215 34 340-347