RT Article T1 Undercover policing: assumptions and empirical evidence JF The British journal of criminology VO 51 IS 2 SP 394 OP 412 A1 Kruisbergen, Edwin W. A1 De Jong, Deborah A1 Kleemans, Edward R. 1967- LA English YR 2011 UL https://krimdok.uni-tuebingen.de/Record/1520730578 K1 Verdeckte Ermittlung K1 Undercover-Agenten K1 Ermittlungsverfahren K1 Niederlande