1. P. I. Alimov, M. A. Zvereva, and O. N. Fedorova, Chemistry and Application of Organophosphorous Compounds [in Russian], Izd. Akad. Nauk SSSR (1955), p. 164.
2. P. I. Alimov and O. N. Fedorova, Izv. Kazansk, Fil. Akad. Nauk SSSR, Ser. Khim. Nauk, No. 6, 48 (1961).
3. L. Sciarini and J. Fruton, J. Amer. Chem. Soc.,71, 2940 (1949).
4. F. R. Atherton, N. T. Openshaw, and A. R. Todd, J. Chem. Soc., 660 (1945).