@article{10_4064_aa_13_3_315_320,
     author = {Imre K\'atai},
     title = {On sets characterizing number-theoretical functions},
     journal = {Acta Arithmetica},
     pages = {315--320},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1967},
     doi = {10.4064/aa-13-3-315-320},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-13-3-315-320/}
}