Before revision: <ref name = "kang-2010"> W. Kang, `` Rate of Convergence for the Legendre Pseudospectral Optimal Control of Feedback Linearizable Systems , Journal of Control Theory and Application, Vol.8, No.4, 2010. pp .391-405.
After revision: <ref name = "kang-2010"> W. Kang, "" Rate of Convergence for the Legendre Pseudospectral Optimal Control of Feedback Linearizable Systems , Journal of Control Theory and Application, Vol.8, No.4, 2010. pp .391-405.