1. Mata Prasad and DharmattiCurr. Sci., 1940,9, 175. Mata Prasad and DharmattiProc. Ind. Acad. Sci., 1940,12, 185. S. S. DharmattiIbid., Proc. Ind. Acad. Sci., 1940,12, 211.
2. PascalCompt. rend., 1921,3, 45.
3. FarquharsonPhil. Mag., 1932,14, 1003.
4. Varadachari and SubramaniamProc. Ind. Acad. Sci. (A), 1936,3, 428.
5. NevgiJ. Univ. Bombay, 1938,7, 82.