1. Walsh, Nature, 159, 164 (1946).
2. Zimakov, Acta physiochemica U.R.S.S., 21, 401 (1946).
3. Dewar, J. Chem. Soc, 406 (1946).
4. Herzberg, "Infra-red and Raman Spectra", 326 (van Nostrand, 1945). Full references to original work are given here.
5. Lespieau and Grédy, C.R. Acad. Sci. Paris, 196, 399 (1933). Timms and Mecke, Z. Phys., 97, 221 (1935). Ananthakrishnan, Proc. Ind. Acad. Sci., 4A, 82 (1936). Kohlrausch and Reitz, Proc. Ind. Acad. Sci., 8A, 255 (1938). Bonner, J. Chem. Phys., 5, 704 (1937). Linnett, J. Chem. Phys., 6, 692 (1938).