1. Bhowmick, J. B.: 1980,Astrophys. Space Sci. 70, 433.
2. Carrus, P., Fox, P. A., Haas, F., and Kopal, Z.: 1951,Astrophys. J. 125, 495.
3. Purohit, S. C.: 1974,J. Phys. Soc. Japan 36(1), 288.
4. Ryazanov, E. V.: 1959,Soviet Phys. Dokl. SSSR 4, 537.
5. Sedov, L. I.: 1959,Similarity and Dimensional Methods in Mechanics, Academic Press, London.