@article{10_4064_ap93_1_4,
     author = {Nikolai Nikolov and Pascal J. Thomas},
     title = {On the zero set of the {Kobayashi{\textendash}Royden} pseudometric
 of the spectral unit ball},
     journal = {Annales Polonici Mathematici},
     pages = {53--68},
     publisher = {mathdoc},
     volume = {93},
     number = {1},
     year = {2008},
     doi = {10.4064/ap93-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap93-1-4/}
}