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4. Murken, J. D. (1979). In Murken, J. D. and Stengel-Rutowski, S. (eds.) Deutschen Forschungsgemeinschaft, 13. Informationsblatt. (Munich)
5. Golbus, M. S., Loughman, W. D., Epstein, C. J., Halbasch, G., Stephens, J. D. and Hall, B. D. (1979). Prenatal genetic diagnosis in 3000 amniocenteses. N. Engl. J. Med., 300, 157