@article{openendedlearninginsymmetriczerosum,
  title = {Open-ended Learning in Symmetric Zero-sum Games},
  author = {David Balduzzi and Marta Garnelo and Yoram Bachrach and Wojciech M. Czarnecki and Julien Perolat and Max Jaderberg and Thore Graepel},
  year = {2019},
  eprint = {1901.08106},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1901.08106v2},
}