@article{IM2_2006_70_5_a0,
     author = {A. R. Alimov},
     title = {Preservation of approximative properties of subsets
},
     journal = {Izvestiya. Mathematics },
     pages = {857--866},
     publisher = {mathdoc},
     volume = {70},
     number = {5},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2006_70_5_a0/}
}