Links
[1] https://www.metrodebogota.gov.co/sites/default/files/Convenio-de-cofinanciacion-Linea-2-Metro-Bogota.pdf
[2] https://www.metrodebogota.gov.co/sites/default/files/Anexo-Convenio-de-cofinanciacion-Linea-2-Metro-Bogota.pdf
[3] https://www.metrodebogota.gov.co/sites/default/files/CONPES-4104.pdf
[4] https://www.metrodebogota.gov.co/sites/default/files/CONPES-4109.pdf