@article{spectrally-extremal-vertices-strong-cospectrality-and-state-transfer,
  title = {{Spectrally extremal vertices, strong cospectrality, and state transfer}},
  author = {G Coutinho},
  year = {2016},
  journal = {The Electronic Journal of Combinatorics 2016},
  eprint = {1501.04398},
  archivePrefix = {arXiv},
  url = {https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i1p46}
}