00561nam a2200181Ia 4500082002000000100002300020245004700043260003500090300002100125500005400146500000500200690000600205700002200211952010200233964001700335921001000352999001700362  a515.35bOv96.GA  aOvsiannikov, L. V.  aGroup analysis of differential equationsb  aNew YorkbAcademic Pressc1982  axvi, 416p. Index  a"Translation from the Russian ed. by W. F. Ames".  a  a   aAmes, W. F. ; ed.  00104070aISIbISId1998-09-25l0o515.35 Ov96.GApDP18540r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a14268  c14268d14268