@article{GDZPPN00247770X,
title = {Matrices with Prescribed Characteristic Polynomial and a Prescribed Submatrix III.},
journal = {Monatshefte f\"ur Mathematik},
volume = {75},
year = {1971},
pages = {441-446},
zbl = {0239.15006},
url = {http://dml.mathdoc.fr/item/GDZPPN00247770X}
}
Neves de Oliveira, Graciano de. Matrices with Prescribed Characteristic Polynomial and a Prescribed Submatrix III.. Monatshefte für Mathematik, Tome 75 (1971) pp. 441-446. http://gdmltest.u-ga.fr/item/GDZPPN00247770X/