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@article{MZ_1984__187_173495, author = {D.R. Heath-Brown}, title = {Diphantine {Approximation} with {Square-free} {Numbers.}}, journal = {Mathematische Zeitschrift}, pages = {335--344}, publisher = {mathdoc}, volume = {187}, year = {1984}, zbl = {0539.10026}, url = {http://geodesic.mathdoc.fr/item/MZ_1984__187_173495/} }
D.R. Heath-Brown. Diphantine Approximation with Square-free Numbers.. Mathematische Zeitschrift, Tome 187 (1984), pp. 335-344. http://geodesic.mathdoc.fr/item/MZ_1984__187_173495/