@article{MASLO_1981__31_4_a5,
     author = {Schwarz, \v{S}tefan},
     title = {The role of semigroups in the elementary theory of numbers},
     journal = {Mathematica slovaca},
     pages = {369--395},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {1981},
     mrnumber = {637966},
     zbl = {0474.10002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1981__31_4_a5/}
}