F. R. H. Gomes, G. da S. Gasparotto, V. de Oliveira, and G. C. Vagetti, “Self-perception of health associated with perception of quality of life in elderly people practicing physical activity in Ponta Grossa, PR, Brazil”, Kairós-Gerontologia, vol. 22, no. 3, pp. 349–368, Sep. 2019.