@article{MZ_1967__102_170869,
     author = {A. Jakimovski and D. Leviatan},
     title = {A {Property} of {Approximation} {Operators} and {Applications} to {Trauberian} {Constants.}},
     journal = {Mathematische Zeitschrift},
     pages = {177--204},
     publisher = {mathdoc},
     volume = {102},
     year = {1967},
     zbl = {0176.34802},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__102_170869/}
}