Approximation by Positive Operators.
Mathematische Zeitschrift, Tome 131 (1973), pp. 273-282.

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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/}
}
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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/