@article{NUMA_1965__7_131660,
     author = {N. GASTINEL},
     title = {Propri\'et\'es de certains ensembles normes de matrices.},
     journal = {Numerische Mathematik},
     pages = {255--260},
     publisher = {mathdoc},
     volume = {7},
     year = {1965},
     zbl = {0168.03103},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1965__7_131660/}
}