@article{MZ_1942__48_168976,
     author = {C. Carath\'eodory},
     title = {Gepaarte {Mengen,} {Verb\"ande,} {Somenringe}},
     journal = {Mathematische Zeitschrift},
     pages = {4--26},
     publisher = {mathdoc},
     volume = {48},
     year = {1942},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MZ_1942__48_168976/}
}