1. Bestimmung derjenigen Abszissen eines Intervalles, für welche die Quadratsumme der Grundfunctionen der Lagrangeschen Interpolation im Intervalle [−1, 1] ein möglichst kleines Maximum besitzt;Fejér;Ann. Scuola, Norm. Sup. Pisa,1932
2. Tchebycheff Systems: With Applications in Analysis and Statistics;Karlin,1966
3. On an extremal problem connected with the fundamental polynomials of interpolation;Balázs;Acta Math. Acad. Sci. Hungary,1978
4. Problems and results on the theory of interpolation, II;Erdős;Acta Math. Acad. Sci. Hungary,1961
5. On a problem of Erdős;Szabados;Acta Math. Acad. Sci. Hungary,1966