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2. Down syndrome: frequency in human populations and factors pertinent to variation in rates;Hook, E.B.,1981
3. Etude des chromosomes somatiques de neuf enfants mongoliens;Lejeune, J.; Gautier, M.; Turpin, M.R.;C R Acad Sci (Paris),1959
4. Molecular genetic approach to the characterization of the "Down syndrome region" of chromosome 21;McCormick, M.K.; Schinzel, A.; Petersen, M.B.,1989
5. Chromosome 21: specific segments that cause the phenotype of Down syndrome;Summitt, R.L.,1981