@article{Aschenbach:2020l9,
  author = "Aschenbach, Bernd",
  title = "{What is the difference between a spinning neutron star and a spinning ´black hole´? - or – evidence for a 1:1 resonance coupling between the rotation/spin frequency and the radial epicyclic frequency at extreme Kerr values of angular momentum.}",
  doi = "10.22323/1.362.0030",
  journal = "PoS",
  year = 2020,
  volume = "MULTIF2019",
  pages = "030"
}