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@article{MAN_1977__229_163004, author = {G. Leha}, title = {Relative {Korovkin-S\"atze} und {R\"ander.}}, journal = {Mathematische Annalen}, pages = {87--95}, publisher = {mathdoc}, volume = {229}, year = {1977}, zbl = {0337.41032}, url = {http://geodesic.mathdoc.fr/item/MAN_1977__229_163004/} }
G. Leha. Relative Korovkin-Sätze und Ränder.. Mathematische Annalen, Tome 229 (1977), pp. 87-95. http://geodesic.mathdoc.fr/item/MAN_1977__229_163004/