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@article{MZ_1973__131_171897, author = {T. Ando and Takashi Sekiguchi and T. Suzuki}, title = {Approximation by {Positive} {Operators.}}, journal = {Mathematische Zeitschrift}, pages = {273--282}, publisher = {mathdoc}, volume = {131}, year = {1973}, zbl = {0243.47026}, url = {http://geodesic.mathdoc.fr/item/MZ_1973__131_171897/} }
T. Ando; Takashi Sekiguchi; T. Suzuki. Approximation by Positive Operators.. Mathematische Zeitschrift, Tome 131 (1973), pp. 273-282. http://geodesic.mathdoc.fr/item/MZ_1973__131_171897/