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/192 Lindsley, O, "Direct measurement and functional definition of vocal hallucinatorysymptoms", Journal of Nervous and Mental Disease, Mar 1963 /193 Lindsley, O, "Direct measurement and functional definition of vocal hallucinatory symptoms", paper to 3rd World Congress of Psychiatry, Montreal, 1961 /194 Lindsley, O, Experimental analysis of cooperation and competition", pre-publication copy read to Eastern Psychological Association, 1961, submitted to Journal of Abnormal and Social Psychology, 1961 /195 Lindsley, O, "Reduction in rate of vocal psychotic syptoms by differential positive reinforcement", Journal of the Experimental Analysis of Behaviour, Vol 2, 1960

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