@misc{indiciaeb3f184d0892e,
  title = {Permian sphenopsids from Antarctica},
  author = {J.F. Rigby},
  year = {1969},
  doi = {10.3133/pp613f},
  url = {https://pubs.usgs.gov/publication/pp613F},
  note = {Source identifier: pp613F}
}