@article{no-laplacian-perfect-state-transfer-in-trees,
  title = {{No Laplacian Perfect State Transfer in Trees}},
  author = {G Coutinho and H Liu},
  year = {2015},
  journal = {SIAM Journal of Discrete Mathematics 2015},
  doi = {10.1137/140989510},
  eprint = {1408.2935},
  archivePrefix = {arXiv},
  url = {https://epubs.siam.org/doi/abs/10.1137/140989510}
}