Effectiveness of an exercise program on postural control in frail older adults - Alfieri, Fábio Marcon; Riberto, Marcelo; Abril-Carreres, Àngels; Boldó-Alcaine, Maria; Rusca-Castellet, Elisabet; Garreta-Figuera, Roser; Battistella, Linamara Rizzo (Clinical interventions in aging, 2012)