RT Article T1 Gang membership transitions and its consequences: Exploring changes related to joining and leaving gangs in two countries JF European journal of criminology VO 12 IS 1 SP 70 OP 91 A1 Weerman, Frank M. 1968- A2 Thornberry, Terence P. A2 Lovegrove, Peter J. LA English YR 2015 UL https://krimdok.uni-tuebingen.de/Record/1912563843 DO 10.1177/1477370814539070