RT Article T1 Abortion legalization and adolescent substance use JF The journal of law & economics VO 49 IS 2 SP 481 OP 505 A1 Charles, Kerwin Kofi A2 Stephens, Jr LA English YR 2006 UL https://krimdok.uni-tuebingen.de/Record/1912447819 DO 10.1086/508249