1. BENSON, W.M., COMPARATIVE PHARMACOLOGY OF LEVORPHAN, RACEMORPHAN AND DEXTRORPHAN AND RELATED METHYL ETHERS, JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS 109: 189 (1953).
2. DAVIS, B.D., J BACTERIOL 71: 123 (1956).
3. FROMHERZ, K, ARCHIVES INTERNATIONALES DE PHARMACODYNAMIE ET DE THERAPIE 85: 387 (1951).
4. Krueger, H. M., The Pharmacology of the Opium Alkaloids: 629 (1941).
5. RANDALL, L. O., JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS 99: 163 (1950).