@misc{Wuebben2026-three-step-he-metrics,
  author = {Bernd Johannes Wuebben},
  title = {{Hermitian–Einstein metrics and small spectra for three-step extensions}},
  year = {2026},
  doi = {10.5281/zenodo.23850990},
  url = {https://doi.org/10.5281/zenodo.23850990},
  note = {Preprint, revised 31 October 2026}
}