@article{01413871,
title = {On the relation between the numerical range and the joint numerical range of matrix polynomials.},
journal = {ELA. The Electronic Journal of Linear Algebra [electronic only]},
volume = {7},
year = {2000},
pages = {20-30},
zbl = {0938.15020},
language = {en},
url = {http://dml.mathdoc.fr/item/01413871}
}
Psarrakos, P.J.; Tsatsomeros, M.J. On the relation between the numerical range and the joint numerical range of matrix polynomials.. ELA. The Electronic Journal of Linear Algebra [electronic only], Tome 7 (2000) pp. 20-30. http://gdmltest.u-ga.fr/item/01413871/