1. Armstrong, P. D., Cannon, J. G., and Long, J. P., Nature, 220, 65 (1968).
2. Chiou, C. Y., Long, J. P., Cannon, J. G., and Armstrong, P. D., J. Pharmacol. Exp. Ther., 166, 243 (1969).
3. Schueler, F. W., J. Amer. Pharm. Ass. Sci. Ed., 45, 197 (1956).
4. Busing, W. R., Ellison, R. D., Levy, H. A., King, S. P., and Roseberry, R. T., The Oak Ridge Computer-controlled X-ray Diffractometer (USAEC publication ORNL 4143, 1968).
5. Jellineck, F., Acta Cryst., 10, 277 (1957).