TY JOUR TI CONVERGENCE ESTIMATE OF FIGHTING KW model KW operator equation KW differential equation KW assessment solution. JO Actual directions of scientific researches of the XXI century: theory and practice AU Petlina, E.M. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov