RT Article T1 Studying terrorism empirically: What we know about what we don't know JF Journal of contemporary criminal justice VO 33 IS 3 SP 273 OP 291 A1 Safer-Lichtenstein, Aaron A2 Loughran, Thomas A. A2 LaFree, Gary 1951- LA English YR 2017 UL https://krimdok.uni-tuebingen.de/Record/1912715554 DO 10.1177/1043986217697873