@article{700922,
     title = {Iterations of linear bounded operators and Kellogg's iterations},
     booktitle = {General Topology and its Relations to Modern Analysis and Algebra},
     series = {GDML\_Books},
     publisher = {Academia Publishing House of the Czechoslovak Academy of Sciences},
     address = {Praha},
     year = {1962},
     pages = {[267]-269},
     mrnumber = {MR0149296},
     zbl = {0196.44903},
     url = {http://dml.mathdoc.fr/item/700922}
}

Marek, I. Iterations of linear bounded operators and Kellogg's iterations, dans General Topology and its Relations to Modern Analysis and Algebra, GDML_Books,  (1962), pp. [267]-269. http://gdmltest.u-ga.fr/item/700922/