Gürel, B.Gürses M.Habibullin, I.2016-02-082016-02-0819940375-9601http://hdl.handle.net/11693/25953Boundary value problems for nonlinear differential equations are considered from the point of view of symmetry. In addition to the known ones new families of boundary conditions are found for integrable equations like the Harry-Dym, KdV and mKdV. © 1994.EnglishArticle10.1016/0375-9601(94)90747-11873-2429