@article{RSMUP_2009__122__1_0,
     author = {Popescu, Angel and Sultana, Sobia},
     title = {Relative {Spectral} {Norm} on {Algebraic} {Numbers}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {1--11},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {122},
     year = {2009},
     mrnumber = {2582826},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_2009__122__1_0/}
}