@article{EXMATH_1992_1992_1_a3,
     author = {Berm\'udez, Teresa and Martin\'on, Antonio},
     title = {Sobre operadores de {Neumann.}},
     journal = {Extracta mathematicae},
     pages = {107-109},
     publisher = {mathdoc},
     volume = {7},
     number = {2-3},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1992_1992_1_a3/}
}