RT Article T1 Infantile autism: a genetic study of 21 twin pairs JF The journal of child psychology and psychiatry VO 18 SP 297 OP 321 A1 Folstein, Susan E. A1 Rutter, Michael 1933- A2 Rutter, Michael 1933- LA English YR 1977 UL https://krimdok.uni-tuebingen.de/Record/1633993280 K1 Autismus K1 Zwillingsforschung