@article{MASLO_1978_28_3_a2,
     author = {Porubsk\'y, \v{S}tefan},
     title = {On theorems of {Niven} and {Dressler}},
     journal = {Mathematica slovaca},
     pages = {243--246},
     year = {1978},
     volume = {28},
     number = {3},
     mrnumber = {534990},
     zbl = {0418.10004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1978_28_3_a2/}
}