1. Barr, M. L., Carr, D. H., and Soltan, H. C. (1964). The XXYY variant of Klinefelter's syndrome.Canad. Med. Ass. J. 90 575?580.
2. Bergman, S., Bjersing, L., and Reitalu, J. (1963). A mentally defective male with Klinefelter's syndrome and probable XXYY/XXY mosaicism.Cytogenetics 2 280?289.
3. Bray, P., and Sr. Ann Josephine (1963). An XXXYY sex-chromosome anomaly.J. Amer. Med. Ass. 184(3 179?182.
4. Carr, D. H., Ban, M. L., and Plunkett, E. R. (1961). A probable XXYY sex determining mechanism in a mentally defective male with Klinefelter's syndrome.Canad. Med. Ass. J. 84 873?888.
5. Court-Brown, W. M. (1969). Sex chromosome aneuploidy in man and its frequency, with special reference to mental subnormality and crinimal behavior.Internat. Rev. Exp. Pathol. 7 31?77.