MALYTS’KA, H. P. Systems of equations of Kolmogorov type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 12, p. 1650–1663, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3279. Acesso em: 5 dec. 2025.