@article{JRAM_1954__193_150272,
     author = {A.M. Ostrowski},
     title = {On the spectrum of a one-parametric family of matrices.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {143--160},
     publisher = {mathdoc},
     volume = {193},
     year = {1954},
     zbl = {0058.25303},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1954__193_150272/}
}