M. Samardziski, G. Zafiroski, C. Tolevska, S. Konstadinova-Kunovska, and V. Vasileva, “Diagnostic and treatment problems with parosteal osteosarcoma. A clinical and a histological study of 7 cases and review of the literature”, Radiol Oncol, vol. 41, no. 3, Sep. 2007.