@article{RMC_2008_2008_1_a17,
     author = {Ichihara, Kazuhiro and  Ushijima, Akira},
     title = {Strongly invertible knots, rational-fold branched coverings, and hyperbolic spatial graphs.},
     journal = {Revista matem\'atica complutense},
     publisher = {mathdoc},
     volume = {21},
     number = {2},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMC_2008_2008_1_a17/}
}