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Barbado, D., Sabido, R., Vera-Garcia, F. J., Gusi-Fuertes, N., y Moreno, F. J. (2012). Effect of increasing difficulty in standing balance tasks with visual feedback on postural sway and EMG: Complexity and performance. Human Movement Science, 31, 1224-1237.
http://www.sciencedirect.com/science/article/pii/S0167945712000115