RT Article T1 Evident and Effective? The Challenges, Potentials and Limitations of Evaluation Research on Preventing Violent Extremism JF International journal of conflict and violence VO 14 IS 2 SP 1 OP 20 A1 Nehlsen, Inga A2 Coester, Marc 1972- A2 Greuel, Frank A2 Milbradt, Björn 1979- A2 Armborst, Andreas A2 Biene, Janusz LA English YR 2020 UL https://krimdok.uni-tuebingen.de/Record/1745902503 K1 Evidence-based K1 Extremism K1 Prevention K1 Evaluation DO 10.4119/ijcv-3801