Crouzeix's Conjecture Holds for Tridiagonal 3 x 3 Matrices with Elliptic Numerical Range Centered at an Eigenvalue

@article{Glader2018CrouzeixsCH,
  title={Crouzeix's Conjecture Holds for Tridiagonal 3 x 3 Matrices with Elliptic Numerical Range Centered at an Eigenvalue},
  author={Christer Glader and M. Kurula and M. Lindstr{\"o}m},
  journal={SIAM J. Matrix Anal. Appl.},
  year={2018},
  volume={39},
  pages={346-364}
}
Crouzeix stated the following conjecture in [Integral Equations Operator Theory, 48 (2004), pp. 461-477]: For every n x n matrix A and every polynomial p, |p(A)| le 2 max_z in W(A)|p(z)|, where W(A... 
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An abstract approach to the Crouzeix conjecture
Some Extensions of the Crouzeix-Palencia Result
On the Uniqueness of Functions that Maximize the Crouzeix Ratio

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