1. T. Friedmann, J. Knoll, in: S. Fürst (ed.), Opiate Receptors and the Neurochemical Correlates of Pain, Pergamon Press, Oxford, 1980, pp. 45–52.
2. T. Friedmann, K. Valkó, in: K. Kelemen, K. Magyar, E.S. Vizi (eds.), Neuropharmacology ‘85, Akadémiai Kiadó, Budapest, 1985, pp. 105–110.
3. D. Brase, W. Dewey, L. Dewey, in: L.B. Wingard Jr., T.M. Brody, L. Lamer, A. Schwartz (eds.), Human Pharmacology — Molecular-to-Clinical, Mosby, St. Louis, MS, 1991, pp. 383–399.