1. Antonakaris SE, Petersen MB, McInnis MG, Adelsberger PA, Schnizel AA, Binkert F, Pangalos C, Raoul O, Slaugenhaupt SA, Hafez M, Cohen MM, Roulson D, Schwartz, S, Mikkelesen M, Tranebjaeg L, Greenberg F, Hoar DI, Rudd NL, Warren AC, Meataxotou C, Bartsocas C, Charavarti A (1992): The meiotic stage of nondisjunction in trisomy 21–determination by using DNA polymorphism. Am. J. Hum. Genet 50: 544–552
2. Bhatia S, Verma IC, Shrivastava S (1992): Congenital heart disease in Down syndrome: an echocardiographic study. Indian Pediatr 29: 1113–1116
3. Botte E. Sekhan BS, Lubs HA (1975): Unexpected high frequency of paternal origin of trisomy 21. Am. J. Hum. Genet 27, Supp. 20A
4. Cedar H (1988): DNA methylation and gene activity. Cell 53: 3–4
5. Cherian VD, Kurien CJ, Das B, Ramachandran EN, Karuppasamy CV, Thampi MV, George KP, Kesavan PC, Koya PK, Chauhan PS (1999): Genetic monitoring of the human population from high-level natural radiation areas of Kerala on the southwest coast of India. II. Incidence of numerical and structural chromosomal aberrations in the lymphocytes of newborns. Rad. Res. 152 (Suppl): 154–158