@article{10_21136_CMJ_1981_101733,
     author = {Schwarz, \v{S}tefan},
     title = {An unconventional problem in the elementary theory of numbers},
     journal = {Czechoslovak Mathematical Journal},
     pages = {159--169},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1981},
     doi = {10.21136/CMJ.1981.101733},
     mrnumber = {604122},
     zbl = {0468.10002},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.21136/CMJ.1981.101733/}
}