A system for transonic wing design with geometric constraints based on an inverse method / by F.J. Brandsma and J.M.J. FrayGeneral relaxation schemes in multigrid algorithms for higher order singularity methods / by B. Oskam and J.M.J. FrayInverse method with geometry constraints for transonic airfoil design / by J.M.J. Fray ... [et al.]Design of transonic airfoils with given pressure, subject to geometric constraints / by J.M.J. Fray ... [et al.]