1. Alabaster, J. S.: 1969, Int. Pest. Control. 11, 29.
2. Allison, D., Kaltman, B. J., and Cope, O. B.: 1963, Sci. 142, 958.
3. Anees, M. A.: 1975, Pakistan J. Zool. 7, 135.
4. Bhatia, S. C., Sharma, S. C., and Venkitasubramaniam, T. A.: 1972, Arch. Environ. Hlth. 24, 362.
5. Cantarow, A. and Schepartz, B.: 1967, ?Text Book of Biochemistry, Saunders Co., Philadelphia, p. 813.