@article{unsupervisedlearningofgraphhierarchical1,
  title = {Unsupervised Learning of Graph Hierarchical Abstractions with Differentiable Coarsening and Optimal Transport},
  author = {Tengfei Ma and Jie Chen},
  year = {2019},
  eprint = {1912.11176},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1912.11176v2},
}