@article{ZNSL_1983_121_a14,
     author = {E. I. Shustin},
     title = {On asymptotic density of some sets of positive integers},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {187--194},
     publisher = {mathdoc},
     volume = {121},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_121_a14/}
}