TY JOUR TI Investigation of one periodic problem methods of the theory of functional differential equations KW functional differential equation KW boundary value problem KW solvability KW mathematical model. JO Actual directions of scientific researches of the XXI century: theory and practice AU Nikishina, I.. AU Volkovich, E.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov