@article{10_1007_s10587_012_0010_0,
     author = {Guti\'errez Garc{\'\i}a, Javier and Kubiak, Tomasz},
     title = {Topological calculus for separating points from closed sets by maps},
     journal = {Czechoslovak Mathematical Journal},
     pages = {257--264},
     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {2012},
     doi = {10.1007/s10587-012-0010-0},
     mrnumber = {2899749},
     zbl = {1249.54035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-012-0010-0/}
}