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- [6] EFFECTS OF CONCENTRATION OF SUCROSE REINFORCEMENT UPON CONCURRENT OPERANT PERFORMANCES PSYCHONOMIC SCIENCE, 1969, 17 (01): : 56 - &
- [7] ROLE OF ADVENTITIOUS REINFORCEMENT IN OPERANT DISCRIMINATION JOURNAL OF EXPERIMENTAL PSYCHOLOGY, 1968, 76 (4P1): : 609 - +
- [8] METHYLMERCURY-INDUCED CHANGES IN OPERANT DISCRIMINATION BY THE PIGEON JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS, 1980, 214 (03): : 620 - 628
- [9] ATTENTION IN PIGEON - ANALYSIS OF RELEVANT STIMULUS IN OPERANT DISCRIMINATION ANNUAL OF ANIMAL PSYCHOLOGY, 1969, 19 (02): : 73 - &