@misc{indiciaea49e5c7ed62a,
  title = {Morphologic interpretation of fertile structures in glossopterid gymnosperms},
  author = {J. M. Schopf},
  year = {1976},
  doi = {10.1016/0034-6667(76)90021-x},
  url = {https://pubs.usgs.gov/publication/70010046},
  note = {Source identifier: 70010046}
}