%0 Journal Article %A Scheumann, Marina %A Call, Josep %+ Department of Developmental and Comparative Psychology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society %T Sumatran orangutans (Pongo abelii) and a yellow-cheeked crested gibbon (Nomascus gabriellae) know what is where : %G eng %U https://hdl.handle.net/11858/00-001M-0000-0010-0106-F %F EDOC: 299230 %R 10.1007/s10764-006-9024-5 %D 2006 %* Review method: peer-reviewed %J International Journal of Primatology %V 27 %N 2 %& 575 %P 575 - 602