F. S. C. Franco, N. M. B. Costa, T. T. Oliveira, G. J. Gomes, K. A. Silva, and A. J. Natali, “Effects of creatine and caffeine supplementation on the bone breaking force in rats subjected to vertical jumping exercise”, JPhysEduc, vol. 23, no. 1, pp. 105-114, Apr. 2012.