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Zumstein, Matthias; Sukthankar, Atul; Exner, Georg Ulrich (2006). Tripartite patella: late appearance of a third ossification center in childhood. Journal of pediatric orthopedics. Part B, 15(1), pp. 75-6. Hagerstown, Md.: Wolters Kluwer Lippincott Williams & Wilkins 10.1097/01202412-200601000-00017
