Journal of the Indian Chemical Society, , vol. 4, p. 409,553 Chem. Zentralbl., , vol. 99, # I p. 650,1938 Journal de Chimie Physique et de Physico-Chimie Biologique, , vol. 24, p. 213 Transactions of the Faraday Society, , vol. 21, p. 556 Z. phys. Ch., , vol. 78, p. 577 Journal of the Indian Chemical Society, , vol. 4, p. 553 Journal of the Chemical Society, , vol. 97, p. 715 Proceedings of the Chemical Society, London, , vol. 22, p. 318