00318nam a2200133Ia 4500008004100000020000700041040003000048082001600078100001600094245002500110260002500135300001200160650001200172190302s9999||||xx |||||||||||||| ||und||  c48  aKharagpur College Library  a530.15bGUP  aB. D. Gupta  aMathematical Physics  bVidyaaKolkatac1978  a1145 p.  aPhysics