Critical sets in parametric optimization. - Hubertus Th. Jongen; P. Jonker; F. Twilt (Math. Program., 1986)

On the classification of plane graphs representing structurally stable rational Newton flows. - Hubertus Th. Jongen; P. Jonker; F. Twilt (J. Comb. Theory B, 1991)

One-Parametric Linear-Quadratic Optimization Problems. - P. Jonker; Georg Still; F. Twilt (Ann. Oper. Res., 2001)