Montoya Castillo, Leyder, Felipe Rojas Calderón, and Marleny Natalia Malaver Rojas. “Advances at the Procurement Public During the Covid 19 in Colombia and Spain”. Scientific journal of social studies 1, no. 1 (December 1, 2022): 312–343. Accessed July 25, 2026. https://portalderevistas.uam.edu.ni/index.php/revistaestudiossociales/article/view/17.