@article{10_4064_aa115_4_3,
     author = {H. A. Helfgott},
     title = {On the square-free sieve},
     journal = {Acta Arithmetica},
     pages = {349--402},
     publisher = {mathdoc},
     volume = {115},
     number = {4},
     year = {2004},
     doi = {10.4064/aa115-4-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa115-4-3/}
}