@article{MS2_1977__41_166543,
     author = {Matti Vuorinen},
     title = {On the {Iversen-Tsuji} theorem quasiregular mappings.},
     journal = {Mathematica Scandinavica},
     pages = {90--98},
     publisher = {mathdoc},
     volume = {41},
     year = {1977},
     zbl = {0375.30007},
     url = {http://geodesic.mathdoc.fr/item/MS2_1977__41_166543/}
}