Souza, Doralice Lange de, and Rosecler Vendrusculo. “ Adherence Factors to Physical Activity Programs for Older Adults: The Experience of the Participants of the ‘Without Borders’ Project ”. Brazilian Journal of Physical Education and Sport, vol. 24, no. 1, Mar. 2010, pp. 95-105, https://doi.org/10.1590/S1807-55092010000100009.