1. The de Lange Syndrome, Institute for Research into Mental Retardation, Monograph No. 2;Berg, J.M.; McCreary, B.D.; Ridler, M.A.C.; Smith, G.F.,1970
2. Brachmann-de Lange syndrome. A report of four cases;York. Choo, P.B.; Bianchi, G.N.;Australian Paediatric Journal,1965
3. In 1933 in Amsterdam, Cornelia de Lange described two infant girls with mental deficiency and a combination of characteristic clinical features. A comprehensive review by Berg et;al,1970
4. Twin 1. She was born after a normal full-term pregnancy. The delivery was uneventful and her birthweight was 1820 g, length 43 cm, head circumference 28.5 cm, chest circumference 29 cm, and Apgar score 4. There was no history of drug ingestion, x-ray exposure, or viral illness during pregnancy. At the age of 5 months her psychomotor development was obviously retarded and contrasted with the normal development presented by her twin sister. At that time her weight was 2960 g, length 52.8 cm