@article{bazán_2005,  title={Matrix polynomials with partially prescribed eigenstructure: eigenvalue sensitivity and condition estimation},  volume={24},  ISSN={1807-0302},  url={https://www.scielo.br/j/cam/a/D6tp8XYNmMssvsSGP5QCSDH/},  number={3},  journal={Computational & Applied Mathematics},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={Bazán, Fermin S. Viloche},  year={2005},  month={Sep},  pages={365–392} }