Geodesic
Korovkin systems for operators of class $S_m$
Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 147-158.

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We give new criteria for the convergence of operators of class $S_m$ to the identity operator. 
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     title = {Korovkin systems for operators of class $S_m$},
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     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a17/}
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R. M. Min'kova. Korovkin systems for operators of class $S_m$. Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 147-158. http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a17/