@article{10_4064_cm_19_2_183_185,
     author = {Gebhard Fuhrken},
     title = {A model with exactly one undefinable element},
     journal = {Colloquium Mathematicum},
     pages = {183--185},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1968},
     doi = {10.4064/cm-19-2-183-185},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-19-2-183-185/}
}