On the numerical radius of matrices and its application to iterative solution methods
Owe Axelsson, Hao Lu, Ben Polman · Linear and Multilinear Algebra · 1994
Uses of the numerical radius in the analysis of basic iterative solution methods, of the SOR method for quasi-Hermitian positive definite matrices (not being consistently ordered) and of maximal eigenvalues of symmetric positive definite matrices using incomplete block-matrix factorizations are presented.