Sabokbar, Afsie, et al. “Macrophage-Osteoclast Differentiation and Bone Resorption in Osteoarthrotic Subchondral Acetabular Cysts”. Acta Orthopaedica, vol. 71, no. 3, Jan. 2000, pp. 255-61, doi:10.1080/000164700317411843.