Morse-Theorie für berandete Mannigfaltigkeiten.
Stability of saddle point problems with penalty
Kritische Punkte bei der nichtlinearen Tschebyscheff-Approximation.
On the Degree of Approximation by Spline Functions with Free Knots.
On the Number of Best Approximations in Certain Non-Linear Families of Functions. (Short Communication).
On the Number of Best Approximation in Certain Non-linear Families of Functions.
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