%0 Journal Article %A Jacobs, Barry E. %T α-Speedable and non α-Speedable Sets %J Canadian journal of mathematics %D 1979 %P 282-299 %V 31 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-030-8/ %R 10.4153/CJM-1979-030-8 %F 10_4153_CJM_1979_030_8