@misc{indiciaef75348a9fd8c,
  title = {Data management system for the China digital seismograph network},
  author = {J.P. Hoffman},
  year = {1987},
  doi = {10.3133/ofr87603},
  url = {https://pubs.usgs.gov/publication/ofr87603},
  note = {Source identifier: ofr87603}
}