@article{10_4064_fm_61_1_73_77,
     author = {F. Bagemihl},
     title = {The hypothesis $2^{\ensuremath{\aleph}_0} \ensuremath{\leq} \ensuremath{\aleph}_n$ and ambiguous points of planar functions},
     journal = {Fundamenta Mathematicae},
     pages = {73--77},
     publisher = {mathdoc},
     volume = {61},
     number = {1},
     year = {1967},
     doi = {10.4064/fm-61-1-73-77},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-61-1-73-77/}
}