%0 Journal Article %A A. Bharucha-Reid %T Ergodic projections for semi-groups of periodic operators %J Studia Mathematica %D 1958 %P 189 %V 17 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/STUMA_1958__17_2_216913/ %G en %F STUMA_1958__17_2_216913