@article{MZM_1983_33_5_a0,
     author = {S. V. Konyagin},
     title = {Sets of points of nonemptiness and continuity of the metric projection},
     journal = {Matemati\v{c}eskie zametki},
     pages = {641--655},
     publisher = {mathdoc},
     volume = {33},
     number = {5},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_5_a0/}
}