@article{10_1090_S0894_0347_06_00549_2,
     author = {Filaseta, Michael and Ford, Kevin and Konyagin, Sergei and Pomerance, Carl and Yu, Gang},
     title = {Sieving by large integers and covering systems of congruences},
     journal = {Journal of the American Mathematical Society},
     pages = {495--517},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {2007},
     doi = {10.1090/S0894-0347-06-00549-2},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-06-00549-2/}
}