@article{10_4064_cm_19_2_225_229,
     author = {Gerald S. Ungar},
     title = {Pseudoregular mappings},
     journal = {Colloquium Mathematicum},
     pages = {225--229},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1968},
     doi = {10.4064/cm-19-2-225-229},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-19-2-225-229/}
}