@article{MZM_1978_23_2_a5,
     author = {G. S. Shpak},
     title = {A~covering for bounded functions, taking given values at two points},
     journal = {Matemati\v{c}eskie zametki},
     pages = {231--235},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1978_23_2_a5/}
}