Hidayat, R., H. Isbagio, B. Setyohadi, and S. Setiati. “Correlation Between Receptor Activator of Nuclear Factor-κβ Ligand (RANKL), and Osteoprotegerin (OPG) With Cartilage Degradation in Rheumatoid Arthritis Patients”. Acta Medica Indonesiana, vol. 46, no. 1, Jan. 2015, https://www.actamedindones.org/index.php/ijim/article/view/60.