RT Article T1 Evidence of problem prevention by early childhood education JF Social intervention SP 87 OP 101 A1 Schweinhart, Lawrence J. A1 Weikart, David P. LA English YR 1987 UL https://krimdok.uni-tuebingen.de/Record/1467958859 SN 3110112566 K1 Interventionsstrategie K1 Soziale Benachteiligung K1 Kinder