@misc{gfp_map_sp_4_r_to_so_2_3,
  author = {{Groups for Physics}},
  title = {Sp(4, R) → SO₀(2,3)},
  howpublished = {Groups for Physics reference},
  url = {https://groups.qft.org/atlas/maps/sp-4-r-to-so-2-3/},
  version = {2026.11-workbench.4},
  note = {Research workbench IV; review status recorded on canonical page}
}