@article{MS2_1979__45_166680,
     author = {Matti Vuorinen},
     title = {Cluster sets and boundary behavior of quasiregular mappings.},
     journal = {Mathematica Scandinavica},
     pages = {267--281},
     publisher = {mathdoc},
     volume = {45},
     year = {1979},
     zbl = {0437.30013},
     url = {http://geodesic.mathdoc.fr/item/MS2_1979__45_166680/}
}