@article{MZ_1969__110_171163,
     author = {Frederick Bagemihl},
     title = {An {Improvement} on {Plessner'} s {Theorem.}},
     journal = {Mathematische Zeitschrift},
     pages = {177--179},
     publisher = {mathdoc},
     volume = {110},
     year = {1969},
     zbl = {0175.07803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__110_171163/}
}