HURNYAK, Ihor; WERBOWA, Oleksandra. Investment Optimal Portfolio as an Answer for Human Needs and Current Trends. Eastern European Journal of Transnational Relations, Bialystok, PL, v. 9, n. 1, p. 79–91, 2025. DOI: 10.15290/eejtr.2025.09.01.07. Disponível em: https://eejtr.uwb.edu.pl/article/view/722. Acesso em: 15 mar. 2026.