RT Article T1 On the robustness and validity of groups JF Journal of quantitative criminology VO 20 IS 1 SP 37 OP 42 A1 Sampson, Robert J. 1956- A2 Doherty, Elaine Eggleston A2 Laub, John H. LA English YR 2004 UL https://krimdok.uni-tuebingen.de/Record/1912641275 DO 10.1023/B:JOQC.0000016698.36239.91