@TECHREPORT{Ort_Per_2011,
author = "Ortiz rodriguez, Linda Vanessa - Castro Calderon, Andrea Melisa",
title = "Perspectivas de la explotacion de Coltan en Colombia",
year = 2011,
institution = "Universidad Colegio Mayor De Cundinamarca",
url = "https://repositorio.unicolmayor.edu.co/handle/unicolmayor/966",
}