@article{MZM_1981_29_5_a1,
     author = {V. N. Zamyatin and A. B. Shishkin},
     title = {Chebyshev centers and $\varkappa$-normal spaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {659--672},
     publisher = {mathdoc},
     volume = {29},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_29_5_a1/}
}