@unpublished{smonad-hydrogen-p21,
  author = {Haj Yousef, Mohamed},
  title = {{Hydrogen as the Rosetta Stone of Projection Metrology}},
  note = {Working manuscript; v1; 42 PDF pages. Synthesis manuscript. Source copy catalogued 2026-10-18.},
  url = {https://www.smonad.com/hydrogen/papers/hydrogen-projection-metrology-synthesis.pdf},
  urldate = {2026-10-18}
}