RT Article T1 Twenty-first century trends in girls' violence and the gender gap: Triangulated findings from official and unofficial longitudinal sources JF Journal of interpersonal violence A1 Steffensmeier, Darrell J. 1942- A2 Zhong, Hua A2 Slepicka, Jessie A2 Schwartz, Jennifer LA English YR 2023 UL https://krimdok.uni-tuebingen.de/Record/1912731312 DO 10.1177/08862605231169733