MONTOYA CASTILLO, Leyder; ROJAS CALDERÓN , Felipe; MALAVER ROJAS , Marleny Natalia. Advances at the procurement public during the Covid 19 in Colombia and Spain. Scientific journal of social studies, NI, v. 1, n. 1, p. 312–343, 2022. DOI: 10.62407/rces.v1i1.17. Disponível em: https://portalderevistas.uam.edu.ni/index.php/revistaestudiossociales/article/view/17. Acesso em: 17 apr. 2026.