TY - RPRT TI - Annotation: growing up as a twin: twin-singleton differences in psychological development. AU - M Rutter AU - J Redshaw PY - 1991 DO - 10.1111/j.1469-7610.1991.tb01916.x UR - https://pubmed.ncbi.nlm.nih.gov/1744192/ ID - 1744192 ER -