Kowalczyk, Stanisław. “PDHdtjtd Systemy PDH Ss: Sieci WAN Nowa Poprawka Tstjsttj”. Translated byMaria Kronhauser. DEMO 12304, no. 130 (April 6, 2022): 45–88. Accessed May 8, 2025. https://ojs34.fimagis.pl/index.php/demo/article/view/69.