%0 Journal Article %T Investigation of one periodic problem methods of the theory of functional differential equations %A Nikishina, I.. %A Volkovich, E.. %K functional differential equation, boundary value problem, solvability, mathematical model. %J Actual directions of scientific researches of the XXI century: theory and practice %D 2014 %N 2 %P 3 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov