@article{GT_2002_6_1_a12,
     author = {Iori, Massimiliano and Piergallini, Riccardo},
     title = {4{\textendash}manifolds as covers of the 4{\textendash}sphere branched over non-singular surfaces},
     journal = {Geometry & topology},
     pages = {393--401},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {2002},
     doi = {10.2140/gt.2002.6.393},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2002.6.393/}
}