@article{EXMATH_2001_2001_1_a13,
     author = {Barraa, Mohamed and Boumazgour, Mohamed},
     title = {Una cota inferior de la norma del operador {X} {\textrightarrow} {AXB} + {BXA.}},
     journal = {Extracta mathematicae},
     pages = {223-227},
     publisher = {mathdoc},
     volume = {16},
     number = {2},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_2001_2001_1_a13/}
}