@article{10_4064_fm_90_3_261_268,
     author = {John Baildon},
     title = {Euler characteristics of 2-manifolds and light open maps},
     journal = {Fundamenta Mathematicae},
     pages = {261--268},
     publisher = {mathdoc},
     volume = {90},
     number = {3},
     year = {1975},
     doi = {10.4064/fm-90-3-261-268},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-90-3-261-268/}
}