TY - JOUR AU - Psarrakos, Panayiotis J. TI - On the estimation of the $q$-numerical range of monic matrix polynomials JO - Electronic transactions on numerical analysis PY - 2004 SP - 1 EP - 10 VL - 17 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ETNA_2004__17__a12/ LA - en ID - ETNA_2004__17__a12 ER -