"Archived copy"(PDF). www.dgeec.gov.py. Archived from the original(PDF) on 16 October 2015. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy"(PDF). www.dgeec.gov.py. Archived from the original(PDF) on 16 October 2015. Retrieved 12 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)