@article{PORMA_1979__38_3-4_115405,
     author = {Kim, Choo-Whan},
     title = {Approximations of contraction operators on $L^\infty $ - {I}},
     journal = {Portugaliae mathematica},
     pages = {213--232},
     publisher = {mathdoc},
     volume = {38},
     number = {3-4},
     year = {1979},
     mrnumber = {0745248},
     zbl = {0526.47016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1979__38_3-4_115405/}
}