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Journal of Comparative Psychology (Washington, D.C. : 1983)|July 13, 2000
Summation of symbols by pigeons (Columba livia): the importance of number and mass of reward itemsA Olthof, W A RobertsJournal of Experimental Psychology. Animal Behavior Processes|April 1, 1985
Short-term memory for simultaneously presented visual and auditory signals in the pigeonP J Kraemer, W A RobertsJournal of Comparative Psychology (Washington, D.C. : 1983)|June 1, 1994
Memory for pictures of upright and inverted primate faces in humans (Homo sapiens), squirrel monkeys (Saimiri sciureus), and pigeons (Columba livia)M T Phelps, W A RobertsJournal of Pediatric Orthopedics|September 1, 1984
Osteomalacia of very-low-birth-weight infantsW A Roberts, V M BadgerJournal of Cognitive Neuroscience|August 24, 2013
Monkey and human face perception: inversion effects for human faces but not for monkey faces or scenesA A Wright, W A RobertsJournal of Comparative Psychology (Washington, D.C. : 1983)|December 1, 1989
Central-place foraging by Rattus norvegicus on a radial mazeM T Phelps, W A RobertsBehavioural Processes|June 5, 2014
Do pigeons show incidental timing? Some experiments and a suggested hierarchical framework for the study of attention in animal cognitionJ E Sutton, W A RobertsJournal of Experimental Psychology. Animal Behavior Processes|October 1, 1982
Some observations of the effects of intertrial interval and delay on delayed matching to sample in pigeonsW A Roberts, P J KraemerPsychological Science|March 29, 2001
Pigeons flexibly time or count on cueW A Roberts, R Coughlin, S RobertsJournal of Experimental Psychology. Animal Behavior Processes|July 1, 1997
Judgements of ordinality and summation of number symbols by squirrel monkeys (Saimiri sciureus)A Olthof, C M Iden, W A RobertsPageof 4