1. Siddheshwar Lal, Raghavan, R., Sreekantan, B. V., Subramamanian, A., and Verma, S. D.Jour. of Phys. Soc. of Japan, 1962,17, Suppl. A-III, 390.
2. --, --, Rangaswamy, T. N., Sreekantan, B. V., Subramanian A., and Verma, S. D.Proc. Int. Conf. on High Energy Physics (CERN,) 1962, p. 641.
3. Ramana Murthy, P. V., Sreekantan, B. V., Subramanian A. and Verma, S. D.Nuclear Instruments and Methods, 1963,23, 245.
4. For a detailed account see for example: Jelley, J. V.,Cerenkov Radiation and its Applications, Pergamon Press, London, 1958.
5. Barclay F. R. and Jelley, J. V.Nuovo Cimento, 1955,2, 27.