@article{GT_2012_16_3_a1,
     author = {Pankka, Pekka and Souto, Juan},
     title = {On the nonexistence of certain branched covers},
     journal = {Geometry & topology},
     pages = {1321--1344},
     publisher = {mathdoc},
     volume = {16},
     number = {3},
     year = {2012},
     doi = {10.2140/gt.2012.16.1321},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2012.16.1321/}
}