1. Bättig, K., Driscoll, P., Schlatter, J., and Uster, H.J. (1976) Pharmacol. Biochem. Behav. 4, 435–439
2. Bättig, K., and Nil, R. (1988) Activ. Nerv. Sup. 30, 103–105
3. Carr, G.D., Fibiger, H.C., and Phillips, A.G. (1989) In: The Neuropharmacological Basis of Reward (J.M. Liebman and S.J. Cooper, Eds), Clarendon Press, Oxford, pp. 264–319
4. Edwards, J.A., Wesnes, K., Warburton, D.M., and Gale, A. (1985) Addict. Behav. 10, 113–126
5. Garg, M. (1969) Psychopharmacologia 14, 432–438