1. Pre-axial polydactylia (double thumb and triphalangia.);Demarinis;Ned Tijdschr Geneesk,1960
2. Un case hyperphalangie du pouce;Dubreuil-Chambardel;Gax Centre Tours,1910
3. Ueber Hyperphalangie des Daumens;Hilgereiner;Beitr Klin Chir,1907
4. Congenital anomalies of the thumb;Barsky;Clin Ortho,1959
5. Contributions to knowledge of the triphalangeal thumb;Mueller;Arch Klin Chir,1936