@misc{gfp_group_u_1,
  author = {{Groups for Physics}},
  title = {U(1)},
  howpublished = {Groups for Physics reference},
  url = {https://groups.qft.org/atlas/groups/u-1/},
  version = {2026.11-workbench.4},
  note = {Research workbench IV; review status recorded on canonical page}
}