@article{MZM_2007_82_5_a7,
     author = {I. A. Pyatyshev},
     title = {Operations on {Approximatively} {Compact} {Sets}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {729--735},
     publisher = {mathdoc},
     volume = {82},
     number = {5},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2007_82_5_a7/}
}