NILSSON, Bo E.; OBRANT, Karl J. Secular Tendencies of the Incidence of Fracture of the Upper End of the Femur. Acta Orthopaedica, [S. l.], v. 49, n. 4, p. 389–391, 1978. DOI: 10.3109/17453677809050093. Disponível em: https://actaorthop.org/actao/article/view/29147. Acesso em: 2 jun. 2026.