@article{10_4064_aa_9_2_161_168,
     author = {R. Rankin},
     title = {Difference sets},
     journal = {Acta Arithmetica},
     pages = {161--168},
     publisher = {mathdoc},
     volume = {9},
     number = {2},
     year = {1964},
     doi = {10.4064/aa-9-2-161-168},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-9-2-161-168/}
}