@article{asimpledifferentiableprogramminglanguage,
  title = {A Simple Differentiable Programming Language},
  author = {Martin Abadi and Gordon D. Plotkin},
  year = {2019},
  eprint = {1911.04523},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1911.04523v4},
}