RT Article T1 The contribution of the Schengen system to the European area of freedom, security and justice JF EuroCriminology IS 17 SP 11 OP 16 A1 Schelter, Kurt 1946- LA English YR 2003 UL https://krimdok.uni-tuebingen.de/Record/1639834257 K1 Schengener Abkommen K1 Auswirkungen K1 Sicherheit