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@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/} }
M. D. Kovalev. A minimal Lebesgue covering exists. Matematičeskie zametki, Tome 40 (1986) no. 3, pp. 401-406. http://geodesic.mathdoc.fr/item/MZM_1986_40_3_a11/