S. E. Varitimidis, A. P. Dimitroulias, T. S. Karachalios, Z. H. Dailiana, and K. N. Malizos, “Outcome after tantalum rod implantation for treatment of femoral head osteonecrosis”, ActaO, vol. 80, no. 1, pp. 20–25, Jan. 2009.