@article{10_4153_S0008439520000661,
     author = {Chan, William},
     title = {Equivalence of codes for countable sets of reals},
     journal = {Canadian mathematical bulletin},
     pages = {580--590},
     year = {2021},
     volume = {64},
     number = {3},
     doi = {10.4153/S0008439520000661},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439520000661/}
}