@article{DA_2004_11_1_a0,
     author = {A. A. Ageev},
     title = {Algorithms with improved estimates for accuracy for the set covering problem},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {3--10},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2004_11_1_a0/}
}