M. M. Ferreira, H. Mansinho, A. Fernandes, F. S. Pereira, and J. A. Assis e Santos, “The rare metastasis of osteosarcoma of a long bone associated with von Recklinghausen’s neurofibromatosis”., Acta Med Port, vol. 7, no. 5, pp. 307–9, May 1994.