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Citation: A. Olthof et Wa. Roberts, Summation of symbols by pigeons (Columba livia): The importance of number and mass of reward items, J COM PSYCH, 114(2), 2000, pp. 158-166

Authors: Sutton, JE Olthof, A Roberts, WA

Citation: Je. Sutton et al., Landmark use by squirrel monkeys (Saimiri sciureus), ANIM LEAR B, 28(1), 2000, pp. 28-42

Authors: Olthof, A Sutton, JE Slumskie, SV D'Addetta, J Roberts, WA

Citation: A. Olthof et al., In search of the cognitive map: Can rats learn an abstract pattern of rewarded arms on the radial maze?, J EXP PSY A, 25(3), 1999, pp. 352-362

Authors: Weisman, R Brownlie, L Olthof, A Njegovan, M Sturdy, C Mewhort, D

Citation: R. Weisman et al., Timing and classifying brief acoustic stimuli by songbirds and humans, J EXP PSY A, 25(2), 1999, pp. 139-152