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@article{DM_1993_5_1_a1, author = {V. N. Sachkov}, title = {Asymptotics of the number of $t$-minimal coverings of a~set}, journal = {Diskretnaya Matematika}, pages = {36--44}, publisher = {mathdoc}, volume = {5}, number = {1}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DM_1993_5_1_a1/} }
V. N. Sachkov. Asymptotics of the number of $t$-minimal coverings of a~set. Diskretnaya Matematika, Tome 5 (1993) no. 1, pp. 36-44. http://geodesic.mathdoc.fr/item/DM_1993_5_1_a1/