@article{CMH_1949__23_138976,
     author = {Heinrich Kapferer},
     title = {\"Uber ein {Kriterium} zur {Fermatschen} {Vermutung.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {64--75},
     publisher = {mathdoc},
     volume = {23},
     year = {1949},
     zbl = {0033.35104},
     url = {http://geodesic.mathdoc.fr/item/CMH_1949__23_138976/}
}