TY JOUR TI The correctness of a different-order mathematical model with with nonsmooth solutions KW mathematical model KW free oscillations KW nonsmooth solutions. JO Actual directions of scientific researches of the XXI century: theory and practice AU Golovko, N.. PY 2015 IS 3 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov