@article{10_4064_sm_131_1_1_17,
     author = {Pekka Koskela and  },
     title = {Quasiconformal mappings and {Sobolev} spaces},
     journal = {Studia Mathematica},
     pages = {1--17},
     year = {1998},
     volume = {131},
     number = {1},
     doi = {10.4064/sm-131-1-1-17},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-131-1-1-17/}
}