@article{10_4153_CJM_1971_008_6,
     author = {Duda, Edwin and Haynsworth, W. Hugh},
     title = {Finite-to-One {Open} {Mappings}},
     journal = {Canadian journal of mathematics},
     pages = {77--83},
     year = {1971},
     volume = {23},
     number = {1},
     doi = {10.4153/CJM-1971-008-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-008-6/}
}