An optimal ultraspherical approximation of integrals. - H. M. El-Hawary; M. S. Salim; H. S. Hussien (Int. J. Comput. Math., 2000)

Ultraspherical Integral Method for Optimal Control Problems Governed by Ordinary Differential Equations. - H. M. El-Hawary; M. S. Salim; H. S. Hussien (J. Glob. Optim., 2003)