@article{IM2_1998_62_6_a6,
     author = {M. Vuorinen and O. Martio and V. I. Ryazanov},
     title = {On the local behaviour of quasi-regular space mappings},
     journal = {Izvestiya. Mathematics},
     pages = {1207--1220},
     year = {1998},
     volume = {62},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1998_62_6_a6/}
}