EMETS, O. A. Extremal properties of nondifferentiable convex functions on euclidean sets of combinations with repetitions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 6, p. 680–691, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5695. Acesso em: 5 dec. 2025.