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@article{MAN_1976__220_162825, author = {Marvi W. Grossman}, title = {Korovkin {Theorems} for {Adapted} {Spaces} with {Respect} to a {Positive} {Operator.}}, journal = {Mathematische Annalen}, pages = {253--262}, publisher = {mathdoc}, volume = {220}, year = {1976}, zbl = {0308.41018}, url = {http://geodesic.mathdoc.fr/item/MAN_1976__220_162825/} }
Marvi W. Grossman. Korovkin Theorems for Adapted Spaces with Respect to a Positive Operator.. Mathematische Annalen, Tome 220 (1976), pp. 253-262. http://geodesic.mathdoc.fr/item/MAN_1976__220_162825/