A test of object permanence in a new-world monkey species, cotton top tamarins (Saguinus oedipus)
Animal Cognition (2003) - Comment
pubmed: 12658533  doi: 10.1007/s10071-003-0162-2  issn: 1435-9448  issn: 1435-9456 

Julie J. Neiworth, Eric Steinmark, Benjamin M. Basile, Ryann Wonders, Frances Steely, Catherine DeHart