Zapata Granada , Mateo, and Hugo Alberto López Duque. “The Principle of Planning As a Cause of Absolute Nullity of State Contracts: A Jurisprudential Analysis from the Principle of Taxation”. Revista de la Facultad de Derecho y Ciencias Políticas 52, no. 136 (January 7, 2022): 124–154. Accessed August 7, 2026. https://revistas.upb.edu.co/index.php/derecho/article/view/7498.