000 00246nam a2200109Ia 4500
008 170320s9999 xx 000 0 und d
100 _aKumar,Tyagi
245 _aApplied physics (E)
260 _bN.B.P;meerut
_c2010
300 _a345
942 _cBK
999 _c90031
_d90031