References
- Wilkinson , J.H . 1965 . The algebraic eigenvalue problem , Cambridge : Oxford University Press .
- Horn , R and Johnson , C . 1985 . Matrix analysis , 185 Cambridge University Press .
- Ortega , J.M and Rheinboldt , W.C . 1970 . Iterative solution of nonlinear equations in several variables , 230 – 234 . New York : Academic Press .