Nikołajew, Jerzy. “From the Cell System to the Electronic Surveillance System. Changes in the Execution of the Custodial Penalty”. The Opole Studies in Administration and Law 17, no. 3 (January 24, 2020): 103–122. Accessed November 2, 2024. https://czasopisma.uni.opole.pl/index.php/osap/article/view/1871.