Dall'Oca, C., et al. “The Treatment of Proximal Humeral Fractures With a ‘Polarus’ Intramedullary Nail”. Acta Biomedica Atenei Parmensis, vol. 85, no. 2, Sept. 2014, pp. 25-30, https://mattioli1885journals.com/index.php/actabiomedica/article/view/3893.