(1)
Zurita-Ortega, F.; Fernández-García, R.; Cepero, M.; Zagalaz-Sánchez, M. L.; Valverde-Cepeda, M.; Ramírez-Domínguez, P. The Relationship Between Pain and Physical Activity in Older Adults That Begin a Program of Physical Activity. J. Hum. Sport Exerc. 2009, 4, 284-297.