@article{10_21136_CPMF_1939_121730,
     author = {Scherk, Peter},
     title = {Eine {Bemerkung} \"uber {Mengen} nat\"urlicher {Zahlen}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {31--32},
     publisher = {mathdoc},
     volume = {68},
     number = {1},
     year = {1939},
     doi = {10.21136/CPMF.1939.121730},
     zbl = {0021.20603},
     language = {ge},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1939.121730/}
}