I-NAN LIEN2018-09-102018-09-101992http://www.scopus.com/inward/record.url?eid=2-s2.0-0026831821&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/295544Locomotor strategies before independent walking: prospective study of 50 mentally retarded children.journal article