@article{RRACEFN_1993_1993_1_a20,
     author = {Costa, A. F.},
     title = {Sobre automorfismos anticonformes y libres de superficies de {Riemann.}},
     journal = {Revista de la Real Academia de Ciencias Exactas, F{\'\i}sicas y Naturales },
     pages = {489-496},
     publisher = {mathdoc},
     volume = {87},
     number = {2-3},
     year = {1993},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/RRACEFN_1993_1993_1_a20/}
}