1. PerkinJ.C.S., 1899,75, 825. Seshadri and co-workersProc. Ind. Acad. Sci., 1945,22 A, 157 and earlier papers.
2. Seshadri and VenkateswarluIbid.,, 1946,23 A, 192.
3. PerkinJ.C.S., 1896,69, 1287.
4. Rajagopalan, Rangaswami, Rao and SeshadriProc. Ind. Acad. Sci., 1946,23 A, 62.
5. Row and SeshadriIbid., 1946,23 A, 35.