Rúa Flechas, M.; Arbeláez Restrepo, J. C.; Castro Beltrán, H. Planning of Public Works Contracts in Colombia: Principle, Duty or Requirement? Obligatoriness and Consequences of Its Inapplication. Opin. jurid. 2019, 18 (37), 93-115. https://doi.org/10.22395/ojum.v18n37a3.