Shakoor, Md. A., Md. Shahidur Rahman, Abul Kalam Azad, and Md. Sadrul Islam. 2010. “Effects of Isometric Quadriceps Muscle Strengthening Exercise on Chronic Osteoarthritis of the Knee”. Bangladesh Medical Research Council Bulletin 36 (1):20-22. https://doi.org/10.3329/bmrcb.v36i1.5502.