RT Article T1 On the measurement of friend behavior in research on friend influence and selection: findings from longitudinal studies of adolescent smoking and drinking JF Journal of youth and adolescence VO 15 IS 4 SP 345 OP 353 A1 Bauman, K. E. A1 Fisher, Lance A. A2 Fisher, Lance A. LA English YR 1986 UL https://krimdok.uni-tuebingen.de/Record/1639381260 K1 Gleichaltrigengruppe K1 Verlaufsstudien