000 00293nam a2200121Ia 4500
008 210219s9999||||xx |||||||||||||| ||und||
082 _a539
_bS457M
100 _aSehgal DL
245 0 _aModern physics
_cSehgal DL
260 _aNew Delhi
_bSultan Chand & Sons
_c1986
300 _a4.118
942 _cBK
999 _c140
_d140