RT Article T1 The importance of peer groups in different regional contexts and biographical stages JF The social world of adolescents SP 280 OP 296 A1 Gaiser, Wolfgang 1946- A2 Müller, Hans-Ulrich LA English YR 1989 UL https://krimdok.uni-tuebingen.de/Record/1474377386 SN 311011996X K1 Gleichaltrigengruppe K1 Soziologischer Kontext K1 Lebenslaufforschung