000 00255nam a2200109Ia 4500
008 190719s9999 xx 000 0 und d
100 _aA.R.Vasistha & A.K.Avastha
245 0 _aMatric
260 _aMerrut
_bKrishna
_c2017
650 _aMath
942 _cBK
999 _c15691
_d15691