00268nam a2200121Ia 4500003000900000008004100009040001600050080001500066100001900081245002700100260000900127300001000136IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a531.5bSIN  aSinha, T. A. K 0aGravitycT. A. K Sinha  c2020  a292p.