@article{10_4064_fm_137_2_97_105,
     author = {Zbigniew Karno},
     title = {On \ensuremath{\omega}-essential mappings onto manifolds},
     journal = {Fundamenta Mathematicae},
     pages = {97--105},
     publisher = {mathdoc},
     volume = {137},
     number = {2},
     year = {1991},
     doi = {10.4064/fm-137-2-97-105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-137-2-97-105/}
}