@article{MZM_1986_40_3_a11,
     author = {M. D. Kovalev},
     title = {A minimal {Lebesgue} covering exists},
     journal = {Matemati\v{c}eskie zametki},
     pages = {401--406},
     publisher = {mathdoc},
     volume = {40},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_40_3_a11/}
}