@article{AFM_1975_1_2_a1,
     author = {O. Martio},
     title = {On k-periodic quasiregular mappings in {Rn}},
     journal = {Annales Fennici Mathematici},
     pages = {207--220},
     publisher = {mathdoc},
     volume = {1},
     number = {2},
     year = {1975},
     doi = {10.5186/aasfm.1975.0109},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1975.0109/}
}