@article{ELMA_1949__4_140516,
     author = {L. Locher-Ernst},
     title = {Das {Imagin\"are} in der {Geometrie.}},
     journal = {Elemente der Mathematik},
     pages = {97--105},
     year = {1949},
     volume = {4},
     zbl = {0034.24003},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1949__4_140516/}
}