ILMAN, O. V.; ILMAN, V. M. FORMALLY STRUCTURAL MODELING OF ECONOMIC SYSTEMS. Science and Transport Progress , [S. l.], v. 10, n. 10, p. 173–177, 2006. DOI: 10.15802/stp2006/19716. Disponível em: https://stp.ust.edu.ua/article/view/19716. Acesso em: 6 may. 2024.