EMETS, O. A.; Roskladka О. V. On estimates of minima of criterion functions in optimization on combinations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 8, p. 1118–1121, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4703. Acesso em: 5 dec. 2025.