%0 Journal Article %A Chan, William %T Equivalence of codes for countable sets of reals %J Canadian mathematical bulletin %D 2021 %P 580-590 %V 64 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000661/ %R 10.4153/S0008439520000661 %F 10_4153_S0008439520000661