RT Article T1 Comparing school-related risk factors of stereotypical bullying perpetration and cyberbullying perpetration JF European journal of criminology VO 19 IS 1 SP 77 OP 97 A1 Bergmann, Marie Christine LA English YR 2022 UL https://krimdok.uni-tuebingen.de/Record/1809402670 K1 Cyberbullying perpetration K1 Stereotypical bullying perpetration K1 General Strain Theory K1 Student Survey