@article{ELA_2009__18__a53,
     author = {Chien, Mao-Ting and Nakazato, Hiroshi},
     title = {The numerical radius of a weighted shift operator with geometric weights},
     journal = {The electronic journal of linear algebra},
     pages = {58--63},
     publisher = {mathdoc},
     volume = {18},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_2009__18__a53/}
}