@article{CMJ_2009__59_4_a16,
     author = {Najati, Abbas and Rassias, Themistocles M.},
     title = {Pexider type operators and their norms in $X_{\lambda }$ spaces},
     journal = {Czechoslovak Mathematical Journal},
     pages = {1087--1094},
     publisher = {mathdoc},
     volume = {59},
     number = {4},
     year = {2009},
     mrnumber = {2563579},
     zbl = {1224.39037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2009__59_4_a16/}
}