[1]
C. P. Rader, T. Barthel, M. Haase, M. Scheidler, and J. Eulert, “Heterotopic ossification after total knee arthroplasty: 54/615 cases after 1-6 years’ follow-up”, ActaO, vol. 68, no. 1, pp. 46–50, Jan. 1997.