@article{whatcanbeestimatedidentifiability,
  title = {What can be estimated? Identifiability, estimability, causal inference and ill-posed inverse problems},
  author = {Oliver J. Maclaren and Ruanui Nicholson},
  year = {2019},
  eprint = {1904.02826},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1904.02826v4},
}