@article{walkmessagepassingneuralnetworksand,
  title = {Walk Message Passing Neural Networks and Second-Order Graph Neural Networks},
  author = {Floris Geerts},
  year = {2020},
  eprint = {2006.09499},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2006.09499v1},
}