1. Arlen W. Frank, Chem. Rev.,61, 389 (1961).
2. V. S. Abramov and V. K. Khairullin, Zh. obshch. khimii,27, 444 (1957).
3. V. K. Khairullin, Summaries of Papers Read at Eighth Mendeleev Congress, Organic Chemistry Section [in Russian], Moscow (1959), p. 409.
4. A. E. Arbuzov, Structure of Phosphorous Acid and Its Derivatives [in Russian], St. Petersburg (1905).
5. V. S. Abramov and V. K. Khairullin, Tr. Kazanskogo khimiko-tekhnologicheskogo instituta im. S. M. Kirova,23, 83 (1957).