1. Felson B, (ed): Dwarfs and other little people. Semin Roentgenol 1973; 8: 258–259
2. Jones KL: Smith’s Recognizable Patterns of Human Malformation. Philadelphia: W.B. Saunders, 1988
3. Kozlowski K, Beighton P: Gamut Index of Skeletal Dysplasias. Berlin: Springer-Verlag, 1984, p 41
4. Taybi H, Lachman RS: Radiology of Syndromes, Metabolic Disorders, and Skeletal Dysplasias. (ed 3 ) Chicago: Year Book Medical Publ, 1990
5. Schmorl G, Junghanns H: The Human Spine in Health and Disease. (ed 2) New York: Grune and Stratton, 1971, pp 344–362