M. Izadi, M. Taghdiri, G. Bagheri, D. Khorshidi, and S. Namdar tajari, “Effects of an Exercise-Oriented Rehabilitation Program on Mechanical Efficiency and Aerobic Capacity in Children with Spastic Cerebral Palsy”, Iran J Child Neurol, vol. 2, no. 3, pp. 41–48, Oct. 2008.