@article{10_4064_fm168_2_4,
     author = {Vladimir Fonf and Menachem Kojman},
     title = {Countably convex $G_{\delta }$ sets},
     journal = {Fundamenta Mathematicae},
     pages = {131--140},
     publisher = {mathdoc},
     volume = {168},
     number = {2},
     year = {2001},
     doi = {10.4064/fm168-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm168-2-4/}
}