@article{10_4064_aa170_4_2,
     author = {Melvyn B. Nathanson and Kevin O'Bryant},
     title = {A problem of {Rankin} on sets without geometric progressions},
     journal = {Acta Arithmetica},
     pages = {327--342},
     publisher = {mathdoc},
     volume = {170},
     number = {4},
     year = {2015},
     doi = {10.4064/aa170-4-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa170-4-2/}
}