1. M. Matsui and I. Yamamoto, “Naturally Occurring Insecticides, Chapter I, Pyrethroids,” ed. by M. Jacobson and D. G. Crossby, Marcel Dekker Inc., New York, 1971, p. 3.
2. J. D. Morrison and H. S. Mosher, “Asymmetric Organic Reactions,” Prentice-Hall, Inc., Englewood Cliffs, New Jersey, 1971, p. 288.