@misc{indiciae75f2561d37a8,
  title = {The optimal number of carboniferous series and stages},
  author = {Manfred Menning and Zdzislaw Belka and Boris Chuvashov and Brian A. Engel and Peter J. Jones and Jurgen Kullmann and John Utting and Lynn Watney and Dieter Weyer},
  year = {2001},
  doi = {10.1127/nos/38/2001/201},
  url = {https://pubs.usgs.gov/publication/70023404},
  note = {Source identifier: 70023404}
}