TROFYMCHUK, O.; VASYANIN, V. A two-step problem of optimizing the structure and routing of flows in a hierarchical multicommodity network. Environmental safety and natural resources, [S. l.], v. 55, n. 3, p. 8–32, 2025. DOI: 10.32347/2411-4049.2025.3.8-32. Disponível em: https://es-journal.in.ua/article/view/343553. Acesso em: 17 jan. 2026.