1. Hunt, G. H., and Odoroff, M. E., Public Health Reports, 77, 41 (1962).
2. Misra, A. L., Mitchell, C. L., and Woods, L. A., Nature, 232, 48 (1971).
3. Cochin, J., and Kornetsky, C., J. Pharmacol. Exp. Ther., 145, 1 (1964).
4. Cochin, J., and Kornetsky, C., Res. Pub. Assoc. Nerv. Ment. Disord., 46, 268 (1967).
5. Himmelsbach, C. K., J. Pharmacol. Exp. Ther., 73, 91 (1941).