<ul><li><a href=https://archiwum.uke.gov.pl/rynek-uslug-pocztowych-12343 target=_blank>UKE Report Postal Market Dominance in 2016</a></li><li><a href=https://uke.gov.pl/en/newsroom/report-on-the-state-of-the-polish-postal-market-in-2020,338.html target=_blank>Report on the state of the postal market in 2020</a></li></ul>