@article{RMI_2001_2001_1_a15,
     author = {Lewis, John L. and Vogel, Andrew},
     title = {Sobre pseudoesferas que son cuasiesferas.},
     journal = {Revista matem\'atica iberoamericana},
     pages = {221-255},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RMI_2001_2001_1_a15/}
}