HULIAHINA, V. STUDYING OF MATERIAL FLOWS OF CHEMICAL PRODUCTS IN VITEBSK REGION. Vestnik of Polotsk State University. Part D. Economic and legal sciences, [S. l.], n. 5, p. 85-87, 2015. Disponível em: https://journals.psu.by/economics/article/view/5682. Acesso em: 12 nov. 2026.