PRITULA, N. N.; SAMOILENKO, A. M. The fifteenth scientific session of mathematical commission of the Shevchenko Scientific Society. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 11, p. 1584, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3868. Acesso em: 27 apr. 2025.