@article{AFM_1972_501-520_a13,
     author = {O. Martio and S. Rickman},
     title = {Boundary behavior of quasiregular mappings},
     journal = {Annales Fennici Mathematici},
     publisher = {mathdoc},
     volume = {501-520},
     year = {1972},
     doi = {10.5186/aasfm.1972.507},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1972.507/}
}