@article{CMH_1974__49_139573,
     author = {Ulrich Felgner},
     title = {Abz\"ahlbarkeit und {Wohlordenbarkeit}},
     journal = {Commentarii mathematici Helvetici},
     pages = {114--124},
     publisher = {mathdoc},
     volume = {49},
     year = {1974},
     zbl = {0283.02046},
     url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139573/}
}