Duque Quintero, Sandra Patricia, Marta Lucía Quintero Quintero, and Álvaro Miguel Villadiego. 2014. “Pension Subsidized Regime: Medellín Case in the Period 1996-2008”. Opinión Jurídica 13 (25). https://revistas.udem.edu.co/index.php/opinion/article/view/864.