Geodesic
Korovkin systems for operators of class $S_m$
Matematičeskie zametki, Tome 13 (1973) no. 1, pp. 147-158 
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/
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     author = {R. M. Min'kova},
     title = {Korovkin systems for operators of class $S_m$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {147--158},
     year = {1973},
     volume = {13},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_1_a17/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We give new criteria for the convergence of operators of class $S_m$ to the identity operator.