Sjödén, Göran O J, Tomas Movin, Peter Güntner, Peter Aspelin, Leif Ahrengart, Hans Ersmark, and Anders Sperber. 1997. “Poor Reproducibility of Classification of Proximal Humeral Fractures: Additional CT of Minor Value”. Acta Orthopaedica 68 (3):239-42. https://doi.org/10.3109/17453679708996692.