RT Article T1 A comparative study of the preventive effects of mandatory sentencing laws for gun crimes JF The journal of criminal law and criminology VO 83 IS 2 SP 378 OP 394 A1 McDowall, David 1949- A2 Wiersema, Brian A2 Loftin, Colin LA English YR 1992 UL https://krimdok.uni-tuebingen.de/Record/1912486229