@article{jachymski_2009, 
  title={Convergence of iterates of linear operators and the Kelisky–Rivlin type theorems}, 
  volume={195}, 
  DOI={10.4064/sm195-2-1}, 
  publisher={Institute of Mathematics, Polish Academy of Sciences}, 
  author={Jachymski}, 
  year={2009}
  }