@article{RRACEFN_1980_1980_1_a28,
     author = {Gir\'aldez Tiebo, Germ\'an},
     title = {Algunos teoremas de aplicaci\'on abierta y de n\'ucleo cerrado.},
     journal = {Revista de la Real Academia de Ciencias Exactas, F{\'\i}sicas y Naturales },
     publisher = {mathdoc},
     volume = {74},
     number = {5},
     year = {1980},
     language = {es},
     url = {http://geodesic.mathdoc.fr/item/RRACEFN_1980_1980_1_a28/}
}