G. Digas, J. Thanner, B. Nivbrant, S. Röhrl, H. Ström, and J. Kärrholm, “Increase in early polyethylene wear after sterilization with ethylene oxideRadiostereometric analyses of 201 total hips”, ActaO, vol. 74, no. 5, pp. 531–541, Jan. 2003.