Chebyshev line approximation : a sensitivity analysis / P. Jonker, M. Streng and F. TwiltOn the partition of real symmetric matrices according to the multiplicities of their eigenvalues / P. Jonker, G. Still and F. TwiltGenericity properties of parametric eigenvalue problems: the case of symmetric generalized and symmetric banded problems / P. Jonker, G. Still and F. TwiltStratification of classes of matrices: the connected components / P. Jonker, G. Still and F. TwiltOne-parametric quadratic optimization problems / P. Jonker, G. Still and F. Twilt
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Gradient Newton-flows : (a survey) / H.Th. Jongen, P. Jonker, F. TwiltOn 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. TwiltGradient Newton-flows for complex polynomials / F. Twilt, P. Jonker, M. StrengOn the critical sets of one-parameter quadratic optimization problems I / M. Henn, P. Jonker and F. TwiltOn the partition of real skew-symmetric n x n-matrices according to the multiplicities of their eigenvalues / P. Jonker ... [et al.]Nonlinear optimization in finite dimensions : Morse theory, Chebyshev approximation, transversality, flows, parametric aspects / by Hubertus Th. Jongen and Peter Jonker and Frank TwiltA note on Branin's method for finding the critical points of smooth functions / Hubertus Th. Jongen, Peter Jonker, Frank Twilt