@article{EXMATH_1991_1991_1_a40,
     author = {Aiena, Pietro and Gonz\'alez, Manuel},
     title = {Operadores inesenciales e incomparabilidad de espacios de {Banach.}},
     journal = {Extracta mathematicae},
     pages = {177-180},
     year = {1991},
     volume = {6},
     number = {2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1991_1991_1_a40/}
}