@article{hcrefhierarchicalconstrainedrefinement,
  title = {HC-Ref: Hierarchical Constrained Refinement for Robust Adversarial Training of GNNs},
  author = {Xiaobing Pei and Haoran Yang and Gang Shen},
  year = {2023},
  eprint = {2312.04879},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2312.04879v1},
}