@article{10_4153_S0008439524000092,
     author = {Camerlo, Riccardo},
     title = {Borel reducibility of equivalence relations on $\omega _1$},
     journal = {Canadian mathematical bulletin},
     pages = {687--700},
     year = {2024},
     volume = {67},
     number = {3},
     doi = {10.4153/S0008439524000092},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439524000092/}
}