@article{PIM_1955_S_S_VIII_08_a12,
     author = {Alfred R\'enyi},
     title = {On {The} {Density} {Of} {Certain} {Sequences} {Of} {Integers}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {157 },
     publisher = {mathdoc},
     volume = {_S_S_VIII},
     number = {08},
     year = {1955},
     url = {http://geodesic.mathdoc.fr/item/PIM_1955_S_S_VIII_08_a12/}
}