Bhowmick, J. B.: 1978,Def. Sci. J. 28, 121.
Laumbach, D. D. and Probstein, R. F.: 1969,J. Fluid Mech. 35, 53.
Möllenhoff, C.: 1976,Astron. Astrophys. 50, 105.
Sakashita, S.: 1971,Astrophys. Space Sci. 14, 431.
Verma, B. G. and Singh, J. B.: 1979,Astrophys. Space Sci. 63, 253.
Verma, B. G. and Singh, J. B.: 1980,Astrophys. Space Sci. 73, 469.
Verma, B. G. and Vishwakarma, J. P.: 1980,Astrophys. Space Sci. 69, 177.