@misc{indiciaeaee809030d94,
  title = {Characteristics of zircons from volcanic ash-derived tonsteins in Late Permian coal fields of eastern Yunnan, China},
  author = {Y. Zhou and Y. Ren and D. Tang and B. Bohor},
  year = {1994},
  doi = {10.1016/0166-5162(94)90018-3},
  url = {https://pubs.usgs.gov/publication/70017591},
  note = {Source identifier: 70017591}
}