RT Article T1 Characteristics and obtainment methods of firearms used in adolescent school shootings JF JAMA pediatrics VO 178 IS 1 SP 73 OP 79 A1 Klein, Brent R. A2 Lewis, Kirstin A2 Schnell, Cory A2 Trowbridge, Jeff LA English YR 2024 UL https://krimdok.uni-tuebingen.de/Record/1912476029 DO 10.1001/jamapediatrics.2023.5093