1. Chen, C.-P., Chern, S.-R., Chang, C.-L., et al. (2000). Prenatal diagnosis and genetic analysis of X chromosome polysomy 49,XXXXY. Prenatal Diagnosis, 20, 754–757.
2. Curfs, L. M., Schreppers-Tijdink, G., Wiegers, A., et al. (1990). The 49,XXXXY syndrome: Clinical and psychological findings in five patients. Journal of Mental Deficiency Research, 34, 277–282.
3. Deng, H. X., Abe, K., Kondo, I., et al. (1991). Parental origin and mechanism of formation of polysomy X: An XXXXX case and four XXXXY cases determined with RFLPs. Human Genetics, 86, 541–544.
4. Galasso, C., Arpino, C., Fabbri, F., et al. (2003). Neurologic aspects of 49,XXXXY syndrome. Journal of Child Neurology, 18, 501–504.
5. Gropman, A. L., Rogol, A., Fennoy, I., et al. (2010). Clinical variability and novel neurodevelopmental findings in 49,XXXXY syndrome. American Journal of Medical Genetics. Part A, 152A, 1523–1530.