1. Remington, J. Amer. Chem. Soc., 67, 1838 (1945).
2. Pauling, "Nature of the Chemical Bond", 139 (Cornell, 2nd edit. 1940).
3. Ramart-Lucas and Hoch, Bull. Soc. Chim., (5), 2, 327 (1935). Bicquard, Bull. Soc. Chim., (5), 8, 55 (1941).
4. Unpublished observations.
5. Morton and de Gouveia, J. Chem. Soc., 911, 916 (1934).