1. Observations on an ethnic classification of idiots. 1866;Down;Ment Retard,1995
2. Imbecility of the Mongolian Type;Shuttleworth;Proc R Soc Med,1909
3. Waardenberg P. Das Menschliche Auge und seine Erbanlagen. Martinus Nijhoff, The Hague; 1932.
4. [Study of somatic chromosomes from 9 mongoloid children];Lejeune;C R Hebd Seances Acad Sci,1959
5. The somatic chromosomes in mongolism;Jacobs;Lancet,1959