ERSKOV, By B.; BOE, C. The Hexatron: A new Thumbgonimeter. Acta Orthopaedica, [S. l.], v. 37, n. 1, p. 58–66, 1966. DOI: 10.3109/17453676608989403. Disponível em: https://actaorthop.org/actao/article/view/30200. Acesso em: 2 may. 2026.