@article{CLTM_1991_1991_1_a19,
     author = {Valdivia, Manuel},
     title = {Resoluciones simult\'aneas del operador identidad en espacios normados.},
     journal = {Collectanea mathematica},
     pages = {265-284},
     publisher = {mathdoc},
     volume = {42},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CLTM_1991_1991_1_a19/}
}