00261nam a2200109Ia 4500100002800000654001200028245003300040260003800073082002000111300000800131546001200139  aSinha/ B/ Moitra/ R.K.   aPhysics  aAstrophysics  and  Cosmology  bNarosa Pub HouseaNew Delhic1995  a523.01bSIN/MOI  a272  aENGLISH