@article{Petshauer2015системы,
author={Petshauer, M.. and Uryvskaya, T.. and Kanishchev, V..},
title={Системы дифференциальных уравнений с положительно определенной матрицей},
journal={Actual directions of scientific researches of the XXI century: theory and practice},
publisher={FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov},
year={2015},
pages={11-15},
volume={3},
issue={5},
}