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4. Long-term effects of physical exercise on working capacity and pulmonary function in cystic fibrosis;Andreasson, B.; Jonson, B.; Kornfalt, R.;Acta Paediatr Scand,1987
5. Cystic fibrosis: physical exercise versus chest physiotherapy;Zach, M.; Oberwaldner, B.; Hausler, F.;Arch Dis Child,1982