1. Tchebycheff Systems: With Applications in Analysis and Statistics;Karlin,1966
2. Integral representation of functions forming a Markov series;Rutman;Soviet Math. Dokl.,1965
3. Integraldarstellung schwacher Markov-Systeme;Schwenker,1988
4. Smoothness properties of generalized convex functions;Zalik,1976
5. Integral representation of Tchebycheff systems;Zalik;Pacific J. Math.,1977