Classification of linear operators satisfying $(Au,v)=(u,A^rv)$ or $(Au,A^rv)=(u,v)$ on a vector space with indefinite scalar product

@misc{kashuba2020classificationlinearoperators,
      title={Classification of linear operators satisfying $(Au,v)=(u,A^rv)$ or $(Au,A^rv)=(u,v)$ on a vector space with indefinite scalar product},
      author={Iryna Kashuba and Vladimir V. Sergeichuk and Victor Senoguchi Borges and Eduardo Ventilari Sodré and André Zaidan},
      year={2020},
      eprint={2012.04052},
      archivePrefix={arXiv},
      primaryClass={math.FA},
      url={https://arxiv.org/abs/2012.04052},
}