PT - JOURNAL ARTICLE AU - Alison D. McDonald TI - Mongolism in Twins AID - 10.1136/jmg.1.1.39 DP - 1964 Sep 01 TA - Journal of Medical Genetics PG - 39--41 VI - 1 IP - 1 4099 - http://jmg.bmj.com/content/1/1/39.short 4100 - http://jmg.bmj.com/content/1/1/39.full SO - J Med Genet1964 Sep 01; 1