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Schumann, Steffen; Thelen, Benedikt; Ballestra, Steven; Nolte, Lutz-Peter; Büchler, Philippe; Zheng, Guoyan (2014). X-ray image calibration and its application to clinical orthopedics. Medical engineering & physics, 36(7), pp. 968-974. Elsevier 10.1016/j.medengphy.2014.04.001