00291nam a2200121Ia 45000030006000000080041000060400015000471000044000622450025001062600009001315460012001400050017001520STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aGupta, P.P.; Yadav, R.P.S.; Malik, G.S.  aMathematical physics  c1984  aEnglish20220125170123.0