Arakaki, J., F. Jennings, G. Estrela, V. Cruz Martinelli, and J. Natour. “Strengthening Exercises Using Swiss Ball Improve Pain, Health Status, Quality of Life and Muscle Strength in Patients With Fibromyalgia: A Randomized Controlled Trial”. Reumatismo, Vol. 73, no. 1, Apr. 2021, pp. 15-23, doi:10.4081/reumatismo.2021.1357.