https://proceedings.mlr.press/v97/rieck19a.html (Any fulltext)
https://github.com/BorgwardtLab/P-WL (Any fulltext)
Rieck, B., Bock, C., & Borgwardt, K. (2019). A Persistent Weisfeiler-Lehman Procedure for Graph Classification. Proceedings of the 36th International Conference on Machine Learning (ICML 2019), PMLR 97, 97, 5448-5458.