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6. Conditioned reinforcement versus time to reinforcement in chain schedules. Williams BA, Royalty P. J Exp Anal Behav; 1990 May; 53(3):381-93. PubMed ID: 2341821 [Abstract] [Full Text] [Related]
7. Choice between reliable and unreliable outcomes: mixed percentage-reinforcement in concurrent chains. Spetch ML, Dunn R. J Exp Anal Behav; 1987 Jan; 47(1):57-72. PubMed ID: 3559459 [Abstract] [Full Text] [Related]