1. Bär, R.Proc. Ind. Acad. Sci., A, 1938,8, 289;Helv. Phys. Acta, 1939,11, 472.
2. Dutta, A. K., and Ghose, B. B.Trans. Bose. Res. Inst., 1941,15, 127.
3. Hiedemann, Seifen and ScheurerNaturwiss., 1936,24, 681.
4. TyrerJour. Chem. Soc., 1914,105, 2539.
5. ShibaJour. Inst. Phys. and Chem. Res. Japan, 1931,16, 205.