@inproceedings{learninghierarchicalstructureswith,
  title = {Learning Hierarchical Structures with Differentiable Nondeterministic Stacks},
  author = {Brian DuSell and David Chiang},
  year = {2021},
  booktitle = {ICLR 2022 4},
  eprint = {2109.01982},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2109.01982v3},
}