Walid, C., M. Islam, A. M. Rahman, M. Islam, M. Hassan, F. Sobhan, and M. Emran. “Effect of Quadriceps Strengthening Exercise on Reduction of Pain in Knee Osteoarthritis”. Bangladesh Medical Journal, vol. 41, no. 3, May 2014, pp. 19-22, doi:10.3329/bmj.v41i3.18953.