@misc{gfp_map_universal_sl_2_r_to_sl_2_r,
  author = {{Groups for Physics}},
  title = {Universal SL(2,R) cover → SL(2,R)},
  howpublished = {Groups for Physics reference},
  url = {https://groups.qft.org/atlas/maps/universal-sl-2-r-to-sl-2-r/},
  version = {2026.11-workbench.4},
  note = {Research workbench IV; review status recorded on canonical page}
}