@article{EXMATH_1991_1991_1_a7,
     author = {Fern\'andez Rodr{\'\i}guez, Fernando and Llerena Achutegui, Agust{\'\i}n},
     title = {Extensi\'on de automorfismos al campo de fracciones racionales.},
     journal = {Extracta mathematicae},
     pages = {25-27},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1991_1991_1_a7/}
}