@misc{indiciaeaef549a53c0a,
  title = {Assessment of undiscovered conventionally recoverable petroleum resources of the Northwest European region},
  author = {Charles D. Masters and H. Douglas Klemme},
  year = {1984},
  doi = {10.3133/cir922a},
  url = {https://pubs.usgs.gov/publication/cir922A},
  note = {Source identifier: cir922A}
}