@article{ELA_1999-2000__6__a2,
     author = {Psarrakos, P.J. and Tsatsomeros, M.J.},
     title = {On the relation between the numerical range and the joint numerical range of matrix polynomials},
     journal = {The electronic journal of linear algebra},
     pages = {20--30},
     publisher = {mathdoc},
     volume = {6},
     year = {1999-2000},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ELA_1999-2000__6__a2/}
}