1. Quantitative Korovkin type theorems on simultaneous approximation;Gonska;Math. Z.,1984
2. Ein Satz vom Korovkin-Typ für Ck-Räume;Knoop;Math. Z.,1976
3. Splines in the Approximation Theory;Korneichuk,1984
4. On convergence of linear positive operators in the space of continuous functions;Korovkin;Dokl. Akad. Nauk SSSR,1953
5. On the order of approximation of functions by linear operators;Korovkin;Dokl. Akad. Nauk SSSR,1957