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