Frøkjæer, Johnny, et al. “Polyethylene Particles Stimulate Monocyte Chemotactic and Activating Factor Production in Synovial Mononuclear Cells in vivo:An Immunohistochemical Study in Rabbits”. Acta Orthopaedica, vol. 66, no. 4, Jan. 1995, pp. 303-7, doi:10.3109/17453679508995549.