@article{10_4153_CMB_1972_058_2,
     author = {Jr., I. Ruzsa},
     title = {On a {Problem} of {P.} {Erd\"os}},
     journal = {Canadian mathematical bulletin},
     pages = {309--310},
     year = {1972},
     volume = {15},
     number = {2},
     doi = {10.4153/CMB-1972-058-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-058-2/}
}