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Wilke, Hans-Joachim; Zanker, Daniel; Wolfram, Uwe (2012). Internal Morphology of Human Facet Joints: Comparing Cervical and Lumbar Spine With Regard to Age, Gender and the Vertebral Core. Journal of anatomy, 220(3), 233 -- 241. Oxford: Wiley-Blackwell 10.1111/j.1469-7580.2011.01465.x
