@article{10_4064_aa_25_2_151_157,
     author = {Imre Ruzsa},
     title = {On difference-sequences},
     journal = {Acta Arithmetica},
     pages = {151--157},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1973},
     doi = {10.4064/aa-25-2-151-157},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-25-2-151-157/}
}