Betancourt Morales, C. M., I. Pinzón Guevara, and J. S. Posada Toro. “PMO IMPLEMENTATION EXPERIENCES IN COMPANIES OF MEDELLIN CITY”. Revista EIA / English Version, vol. 11, no. 21, June 2014, pp. 133-4, https://revistapostgrado.eia.edu.co/index.php/Reveiaenglish/article/view/928.