1. Albus, K., Schott, M., Herz, A.: Interaction between morphine and morphine antagonists after systemic and intravenous application. Europ. J. Pharmacol.12, 53 (1970).
2. Algeri, S., Costa, E.: Physical dependence on morphine fails to increase serotonin turnover rate in rat brain. Biochem. Pharmacol.20, 877 (1971).
3. Altenburg, V., Kuschinsky, K.: Interaction between morphine and neurotransmitters in the central nervous system. Naunyn-Schmiedebergs Arch. Pharmak.270 Suppl., R 3 (1971).
4. Beckett, A. H., Casy, A. F.: Synthetic analgesics: Stereochemical considerations. J. Pharm. Pharmacol.6, 986 (1954).
5. Bednarczyk, J. H., Smith, C. B., Sheldon, M. I., Villarreal, J. E.: Tolerance to the effects of morphine upon the incorporation of14C-tyrosine (14C-tyr) into14C-catecholamines (14C-CA) in mouse brain and adrenals. Pharmacologist12, 230 (1970).