RT Article T1 The Bielefeld longitudinal study on early identification of risks in learning read and write: theoretical background and first results JF Children at risk SP 268 OP 294 A1 Skowronek, Helmut 1931-2019 A2 Marx, Harald 1947- LA English YR 1989 UL https://krimdok.uni-tuebingen.de/Record/1478302372 SN 3110121344 K1 Legasthenie