Gradient Newton-flows : (a survey) / H.Th. Jongen, P. Jonker, F. TwiltOn linearization and continuous selections of functions / H.Th. Jongen, D. PallaschkeOn the classification of plane graphs representing structurally stable rational Newton-flows / H.Th. Jongen, P. Jonker, F. TwiltOn the classification of plane graphs representing structurally stable rational Newton-flows / H.Th. Jongen, P. Jonker, F. TwiltSemi-infinite optimization: structure and stability of the feasible set / H.Th. Jongen, F. Twilt, G.W. WeberNonlinear optimization in finite dimensions : Morse theory, Chebyshev approximation, transversality, flows, parametric aspects / by Hubertus Th. Jongen and Peter Jonker and Frank TwiltOn non-convex optimization / door Hubertus Theodorus JongenA note on Branin's method for finding the critical points of smooth functions / Hubertus Th. Jongen, Peter Jonker, Frank Twilt" Nichtlineare Analysis und Optimierung" / H.Th. JongenOn regular minimax optimization / H.Th. Jongen and G. Zwier