00282nam a2200109Ia 4500100002600000250000600026654001400032245007000046260003600116300000800152546001200160  aBrahma Nand & others   a4  aspherical  aSpherical Harmonics  and Partial  differential  equations  8th ed  bKedar nath ram nath co.aMeerut  a167  aENGLISH