00297nam a2200109Ia 4500008004100000082001800041100002100059245005300080260003300133300001000166650001100176060110s9999    xx            000 0 und d  a523.01bBAS/I  aBASU, Baidyanath 3aAn introduction to astrophysicscBaidyanath Basu  bPrentice Hall of Indiac1997  a489p.  a523.01