@article{10_4153_S0008439519000699,
     author = {Leiderman, Arkady and Tkachenko, Mikhail},
     title = {Separable {Quotients} of {Free} {Topological} {Groups}},
     journal = {Canadian mathematical bulletin},
     pages = {610--623},
     year = {2020},
     volume = {63},
     number = {3},
     doi = {10.4153/S0008439519000699},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439519000699/}
}