@article{EXMATH_1987_1987_1_a36,
     author = {Ben{\'\i}tez, Carlos and Fern\'andez, Manuel},
     title = {Caracterizaci\'on funcional de aproximaci\'on buena y mejor en espacios producto normados.},
     journal = {Extracta mathematicae},
     pages = {114-116},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1987_1987_1_a36/}
}