"Archived copy". www.cerro.com.py. Archived from the original on 27 August 2018. Retrieved 22 May 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy". www.cerro.com.py. Archived from the original on 27 August 2018. Retrieved 22 May 2022.{{cite web}}: CS1 maint: archived copy as title (link)