1. Bauer, F., and Fike, C.: ‘Norms and exclusion theorems’, Numer. Math. 2 (1960), 137–141.
2. Deif, A.: Sensitivity analysis in linear systems, Springer, 1986.
3. Deif, A.: ‘Realistic a priori and a posteriori bounds for computed eigenvalues’, IMA J. Numer. Anal 9 (1990), 323–329.
4. Deif, A.: Advanced matrix theory for scientists and engineers, 2second ed., Gordon&Breach, 1991.
5. Deif, A.: ‘Rigorous perturbation bounds for eigenvalues and eigenvectors of a matrix’, J. Comput. Appl. Math. 57 (1995), 403–412.