000 00293nam a2200133Ia 4500
100 _aGUPTA B D
650 _aPhysics
365 _cRS
365 _d1
942 _cENGBK
245 _aMathematical Physics
260 _bVikas Publishing House Pvt Ltd
_c1987
_aNew Delhi
300 _aXIII+1240PP
999 _c25138
_d25138