Touloupakis, G., Stuflesser, W., Ferrara, F., Maione, A., Antonini, G., & Crippa, C. (2017). Early-stage radiological critical analysis of unsuccessful cases following a four-part fracture osteosynthesis of the proximal humerus: focus on the “P” sign. Acta Biomedica Atenei Parmensis, 88(2), 178-184. https://doi.org/10.23750/abm.v88i2.5295