CUI, Mingyan. Reducing the Proportion of Single-source Procurement Management Application. Transactions on Economics, Business and Management Research, [S. l.], v. 4, p. 189–193, 2024. DOI: 10.62051/bh9a9g43. Disponível em: https://wepub.org/index.php/TEBMR/article/view/539. Acesso em: 16 may. 2026.