@misc{indiciaeda71489449d3,
  title = {The Permian-Triassic boundary \& mass extinction in China},
  author = {I. Metcalfe and R.S. Nicoll and R. Mundil and C. Foster and J. Glen and J. Lyons and W. Xiaofeng and W. Cheng-Yuan and P.R. Renne and L. Black and Q. Xun and M. Xiaodong},
  year = {2001},
  url = {https://pubs.usgs.gov/publication/70022726},
  note = {Source identifier: 70022726}
}