@article{EXMATH_1986_1986_1_a40,
     author = {Ben{\'\i}tez, Carlos and Fern\'andez, Manuel},
     title = {Normas en espacios producto que mantienen propiedades de aproximaci\'on.},
     journal = {Extracta mathematicae},
     pages = {139-141},
     year = {1986},
     volume = {1},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1986_1986_1_a40/}
}