Gravity and solidity in four great ape species (Gorilla gorilla, Pongo pygmaeus, Pan troglodytes, Pan paniscus): vertical and horizontal variations of the table task

Journal of Comparative Psychology (2009) - Comment
pubmed: 19450024 doi: 10.1037/a0013580 issn: 0735-7036 issn: 1939-2087

Trix Cacchione, Josep Call, Robert Zingg