1. A moment problem in L1-approximation;Hobby,1965
2. Tchebycheff Systems: With Applications in Analysis and Statistics;Karlin,1966
3. On an L1-approximation problem;Kroó,1985
4. Chebyshev rank in L1 -approximation;Kroó;Trans. Amer. Math. Soc.,1986
5. Best L1-approximation with varying weights;Kroó,1987