@article{perfect-state-transfer-in-products-and-covers-of-graphs,
  title = {{Perfect state transfer in products and covers of graphs}},
  author = {G Coutinho and C Godsil},
  year = {2016},
  journal = {Linear and Multilinear Algebra 2016},
  doi = {10.1080/03081087.2015.1033381},
  eprint = {1501.04396},
  archivePrefix = {arXiv},
  url = {https://www.tandfonline.com/doi/abs/10.1080/03081087.2015.1033381}
}