00578nam a2200181Ia 4500082002000000100004200020245004400062260003600106300002200142490004300164500000500207690000600212700003200218952010200250964001700352921001000369999001700379  a515.35bB658.SD  aBlumen, George W. and Kumei, Sukeyuki  aSymmetries and differential equationsb  aNew YorkbSpringer-Verlagc1989  axiii, 412p. Index  aApplied Mathematical Sciences v v. 81  a  a   aKumei, Sukeyuki ; jt. auth.  00104070aISIbISId1998-09-22l0o515.35 B658.SDpDP21526r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a13031  c13031d13031