@misc{W2102947943,
  author = {Thomas J. Algeo and J. Barry Maynard},
  title = {Trace-element behavior and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems},
  year = {2004},
  howpublished = {Chemical Geology},
  doi = {https://doi.org/10.1016/j.chemgeo.2003.12.009}
}