000 00423nam a2200145Ia 4500
008 180713s9999 xx 000 0 und d
082 _a530.15 G2
100 _a"Gupta, B D "
245 0 _aMathematical Physics
260 _aMeerut
260 _b Pragati Prakashan
260 _c1969
365 _b645
942 _cBK
999 _c113221
_d113221