@article{ELMA_1953__8_140597,
     author = {Paul Bernays},
     title = {\"Uber die {Verwendung} der {Polygoninhalte} an {Stelle} eines {Spiegelungsaxioms} in der {Axiomatik} der {Planimetrie.}},
     journal = {Elemente der Mathematik},
     pages = {102--107},
     publisher = {mathdoc},
     volume = {8},
     year = {1953},
     zbl = {0053.41901},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1953__8_140597/}
}