Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1972_207_5_a13, author = {F. V. Shirokov and V. A. Signayevskiy}, title = {Minimum coverings of a finite set}, journal = {Doklady Akademii Nauk}, pages = {1066--1069}, publisher = {mathdoc}, volume = {207}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a13/} }
F. V. Shirokov; V. A. Signayevskiy. Minimum coverings of a finite set. Doklady Akademii Nauk, Tome 207 (1972) no. 5, pp. 1066-1069. http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a13/