@article{DMSMF_2004_2004_1_a2,
     author = {Hilden, H. M. and  Montesinos, J. M. and  Tejada, D. M. and  Toro, M. M.},
     title = {Knots, butterflies and 3-manifolds..},
     journal = {Disertaciones del Seminario de Matem\'aticas Fundamentales},
     publisher = {mathdoc},
     volume = {33},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMSMF_2004_2004_1_a2/}
}