Gutiérrez, Francisco. “A Special Relationship: Privatization of Security, Vulnerable Elites and Political System in Colombia (1982-2002)”. Estudios Socio-Jurídicos, vol. 14, no. 1, Mar. 2012, pp. 97-134, https://revistas.urosario.edu.co/index.php/sociojuridicos/article/view/1938.