El Majd, B. A. ., J.-A. . Désidéri, and R. . Duvigneau. “Multilevel Strategies for Parametric Shape Optimization in Aerodynamics”. European Journal of Computational Mechanics, vol. 17, no. 1-2, Oct. 2008, pp. 149-68, doi:10.13052/REMN.17.149-168.