RT Article T1 Crime gun risk factors: Buyer, seller, firearm, and transaction characteristics associated with gun trafficking and criminal gun use JF Journal of quantitative criminology VO 30 IS 2 SP 285 OP 315 A1 Koper, Christopher S. LA English YR 2014 UL https://krimdok.uni-tuebingen.de/Record/1912497964 DO 10.1007/s10940-013-9204-3