@article{MZM_1990_48_4_a13,
     author = {I. G. Tsar'kov},
     title = {Properties of the sets that have a~continuous selection from the operator~$P^\delta$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {122--131},
     year = {1990},
     volume = {48},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_4_a13/}
}