1. Ando, K.: The discriminative control of operant behavior by intravenous administration of drugs in rats. Psychopharmacologia (Berl.) 45: 47–50, 1975.
2. Barry, H., III: Prolonged measurements of discrimination between alcohol and nondrug states. J. comp, physiol. Psychol. 65: 349–352, 1968.
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4. Barry, H., III and Krimmer, E. C.: Pentobarbital effects perceived by rats as resembling several other depressants but not alcohol. Proc, 80th Ann. Convention, Amer. Psychol. Assoc. 7: 849–850, 1972.
5. Barry, H., III and Kubena, R. K.: Discriminative stimulus characteristics of alcohol, marihuana and atropine. In Drug Addiction, vol. 1, Experimental Pharmacology, ed. by J. M. Singh, L. H. Miller and H. Lal, pp. 3–16, Futura Publishing Co., Mt. Kisco, N. Y., 1972.