%0 Journal Article %A Soare, Robert I. %T The Friedberg-Muchnik Theorem Re-Examined %J Canadian journal of mathematics %D 1972 %P 1070-1078 %V 24 %N 6 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-110-4/ %R 10.4153/CJM-1972-110-4 %F 10_4153_CJM_1972_110_4