1. M. Lipkin, in “Physiology of the Gastrointestinal Tract,” 2nd Ed., ed. by L. R. Johnson, Raven Press, New York, 1987, pp. 255–284.
2. H. Inoue, in “Seikagaku Jikken Koza (in Japanese),” Vol. 11 (Part II), ed. by Y. Nishizuka, O. Hayaishi, and H. Wada, Tokyo Kagaku Dojin, Tokyo, 1977, pp. 951–960.
3. S. A. Granz, in “Primer of Biostatistics,” 2nd Ed., McGraw-Hill, New York, 1987, pp. 1–379.