Ghasemi, E., Shayegannejad, V., Ashtari, F., & Chitsaz, A. "The effectiveness of Frenkel’s and Swiss ball exercises on improved balance and decreased depression in patients with multiple sclerosis: a comparative study" .e16454 , Journal of Research in Rehabilitation Sciences, 7, 3, 2011, e16454. doi: 10.22122/jrrs.v7i3.278