RT Article T1 The maintenance of security and control in prisons, including links with society JF Penological information bulletin VO 17 SP 4 OP 10 A1 Frisching, Arthur de LA English YR 1992 UL https://krimdok.uni-tuebingen.de/Record/164026518X K1 Strafvollzug K1 England K1 Vollzugslockerung K1 Sicherheit