@article{NUMA_1970__15_131998,
     author = {G.N. de OLIVEIRA},
     title = {Note on an {Inverse} {Characteristic} {Value} {Problem.}},
     journal = {Numerische Mathematik},
     pages = {345--347},
     publisher = {mathdoc},
     volume = {15},
     year = {1970},
     zbl = {0202.03504},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1970__15_131998/}
}