00311nam a2200121Ia 45000030006000000080041000060400015000471000030000622450059000922600009001515460012001600050017001720STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aDharma Vira; Mittal, S.C.  aPartial differential equations and spherical harmonics  c1968  aEnglish20220125165942.0