@article{EXMATH_1987_1987_1_a19,
     author = {Fern\'andez Castillo, Jes\'us M.},
     title = {Propiedades de aproximaci\'on definida sobre ideales de operadores},
     journal = {Extracta mathematicae},
     pages = {68-70},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1987_1987_1_a19/}
}