00327nam a2200133Ia 45000030006000000080041000060400015000471000024000622450058000862500011001442600009001555460012001640050017001760STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aBrahma Nand; Others  aSperical harmonics and partial differential equations  aSecond  c1964  aEnglish20220125165946.0