%0 Journal Article %T Системы дифференциальных уравнений с положительно определенной матрицей %A Petshauer, M.. %A Uryvskaya, T.. %A Kanishchev, V.. %K positive definite matrix, differential equation, external perturbation, the Lyapunov condition. %J Actual directions of scientific researches of the XXI century: theory and practice %D 2015 %N 3 %P 4 %I FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov