Azzali, E., G. Milanese, I. Martella, M. Ruggirello, V. Seletti, C. Ganazzoli, N. E. Bono, F. Negri, F. Pogliacomi, and M. De Filippo. “Imaging of Osteonecrosis of the Femoral Head”. Acta Bio Medica Atenei Parmensis, Vol. 87, no. 3 - S, July 2016, pp. 6-12, https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/5634.