TY JOUR TI SOME LINEAR AND NONLINEAR EQUATIONS OF HIGHER ORDER KW linear and nonlinear equations KW Korteweg-de Vries equation KW boundary conditions KW non-uniqueness of solution KW instability of solution KW graphs of solutions JO Science Evolution AU Chuesheva, N.A. AU Chueshev, A.V. PY 2016 IS 1 PB Kemerovo State University