@misc{indiciaeb5be379eecfa,
  title = {APRAS; analytic petroleum resource appraisal system; microcomputer programs for play analysis using a field-size model},
  author = {R. A. Crovelli and R.H. Balay},
  year = {1992},
  doi = {10.3133/ofr9221b},
  url = {https://pubs.usgs.gov/publication/ofr9221B},
  note = {Source identifier: ofr9221B}
}