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@article{MZM_1979_25_3_a11, author = {R. M. Min'kova}, title = {Weak {Korovkin} spaces}, journal = {Matemati\v{c}eskie zametki}, pages = {435--443}, publisher = {mathdoc}, volume = {25}, number = {3}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_3_a11/} }
R. M. Min'kova. Weak Korovkin spaces. Matematičeskie zametki, Tome 25 (1979) no. 3, pp. 435-443. http://geodesic.mathdoc.fr/item/MZM_1979_25_3_a11/