@article{AFM_1980_5_1_a6,
     author = {Pekka Tukia},
     title = {On two-dimensional quasiconformal groups},
     journal = {Annales Fennici Mathematici},
     pages = {73--78},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1980},
     doi = {10.5186/aasfm.1980.0530},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1980.0530/}
}