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Ferguson, Stephen J; Visser, Judith M A; Polikeit, Anne (2006). The long-term mechanical integrity of non-reinforced PEEK-OPTIMA polymer for demanding spinal applications: experimental and finite-element analysis. European spine journal, 15(2), pp. 149-56. Berlin: Springer-Verlag; http://www.springer.de 10.1007/s00586-005-0915-5
