“Formulation and programming of the Annual Contracting Plan: Basic Model to improve purchases, Provincial Municipality of Gran Chimú 2020”, Scién. Inge., vol. 17, no. 4, pp. 201–206, Dec. 2021, Accessed: Jul. 18, 2026. [Online]. Available: https://revistas.unitru.edu.pe/index.php/PGM/article/view/4079