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Siepe, Christoph J., Franziska Heider, Elisabeth Haas, Wolfgang Hitzl, Ulrike Szeimies, Axel Stäbler, Christoph Weiler, Andreas G. Nerlich, ja Michael H. Mayer. Influence of Lumbar Intervertebral Disc Degeneration On the Outcome of Total Lumbar Disc Replacement: A Prospective Clinical, Histological, X-ray and MRI Investigation. Springer-Verlag, 2012.

Siepe, Christoph J., et al. Influence of Lumbar Intervertebral Disc Degeneration On the Outcome of Total Lumbar Disc Replacement: A Prospective Clinical, Histological, X-ray and MRI Investigation. Springer-Verlag, 2012.