1. Approximation of Functions;Lorentz,1966
2. I polinomi d'approssimazione di Tchebychev;Tonelli;Annali di Matematica Pura ed Applicata, Serie III,1908
3. A remark on the polynomials of Chebychev, deviating least from a given function;Kolmogorov;Uspehi,1948
4. Simultaneous Chebyshev approximation of functions on an interval;Dunham,1967
5. Reelle Funktionen;Hahn,1948