1. A historical viewpoint: Down syndrome growing and learning;Pueschel,1981
2. Advances in the understanding of chromosome 21 and Down syndrome;Korenberg,1992
3. Oral pathology clinical pathologic correlations;Regezi,1989
4. Recognizable pattern of human malformations;Smith,1988
5. Developmental assumptions about Down syndrome and the myth of uniformity;Hayes,1991