@article{secondorderinductiveinferenceanaxiomatic,
  title = {Second-order Inductive Inference: an axiomatic approach},
  author = {Patrick H. O'Callaghan},
  year = {2019},
  eprint = {1904.02934},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1904.02934v5},
}