1. Ballet, G., and Rose, F. (1905). Nouv. Iconogr. Salpet., 18, 404.
2. Bell, J., and Carmichael, E. A. (1939). In The Treasury of Hunian
3. (Pt. 3: On Hereditary Ataxia and Spastic Paraplegia);Inheritance
4. Bickerstaff, E. R. (1950). J. Neurol. Neurosuirg. Psychiat., 13, 134.
5. Dick, A. P., and Stevenson, C. J. (1953). Lancet, 1, 921.