@article{PM_1989_1989_1_a26,
     author = {Turiel Sand{\'\i}n, Francisco Javier},
     title = {Una prueba elemental del teorema de {Lima} para superficies.},
     journal = {Publicacions matem\`atiques},
     pages = {555-557},
     year = {1989},
     volume = {33},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PM_1989_1989_1_a26/}
}