@article{salomaa2020,
  title={Journal of Universal Computer Science},
  author={Arto Salomaa and Cristian S. Calude and Hermann Maurer},
  year={2020},
  journal={Zenodo (CERN European Organization for Nuclear Research)},
  doi={10.3217/jucs-000-00-0109},
  url={https://doi.org/10.3217/jucs-000-00-0109}
}