Kowalczyk S. PDHdtjtd Systemy PDH ss: Sieci WAN nowa poprawka tstjsttj. DEM [Internet]. 2022 Apr. 6 [cited 2026 Oct. 22];12304(130):45-88. Available from: https://fimagis.pl/exs/ojs/index.php/demo/article/view/69