TY JOUR TI The theorem of the resolution of the inverse problem of variation calculus for the ordinary differential equations of the sixth order KW the differential equations KW the inverse problem of variation calculus KW functional KW Frechet differential JO Actual directions of scientific researches of the XXI century: theory and practice AU Kobzistyy, S.. AU Andreeva, N.. AU Korchagina, E.. AU Korchagin, V.. PY 2014 IS PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov