1. M. Matsui and I. Yamamoto, “Naturally Occurring Insecticides,” ed. by M. M. Jacobson and D. G. Crosby, Marcel Dekker, New York, 1971, pp. 4~70.
2. a) H. L. Holmes, “Organic Reactions,” Vol. 4, ed. by R. Adams, John Wiley and Sons, New York, 1948 p. 60. b) J. C. Lunt and F. Sondheimer,J. Chem. Soc. C,1950, 3650.