@article{10_2140_agt_2007_7_1561,
     author = {Freedman, Michael H and Gabai, David},
     title = {Covering a nontaming knot by the unlink},
     journal = {Algebraic and Geometric Topology},
     pages = {1561--1578},
     year = {2007},
     volume = {7},
     number = {3},
     doi = {10.2140/agt.2007.7.1561},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2007.7.1561/}
}