1. Edward, J. H., Harnden, D. G., Cameron, A. H., Crosse, V. M., Wolff, O. H. A new trisomic syndrome. 1960: Lancet i, 787.
2. Nielsen, J., Holm, V., Haar, J. Prevalence of Edward’s Syndrome. Clustering or seasonal variation? Humangentik. 1975: 26, 113–116.
3. Conen, P., Erkman, B. Frequency and occurrence of chromosomal syndromes. II. E.Trisomy. Am. J. Hum. Gen. 1966: 18, 387.
4. Carter, P. E., Pearn, J. H., Bell, J., Martin, N., Anderson, N. G. Survival in trisomy 18. Clin. Gen. 1985: 27, 59–61.
5. Weber, W. W. Survival and the sex ratio in trisomy 17–18. Am. J. Hum. Gen. 1967: 19, 369–77.