@article{measuringtimewithminimalclocks,
  title = {Measuring Time with Minimal Clocks},
  author = {Andrei D. Robu and Christoph Salge and Chrystopher L. Nehaniv and Daniel Polani},
  year = {2019},
  eprint = {1906.07564},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1906.07564v1},
}