@misc{indiciae39eac4f08259,
  title = {Differential spectra for the 1979 El Centro and the 1984 Morgan Hill, California earthquakes},
  author = {G.N. Bycroft and P. N. Mork},
  year = {1987},
  doi = {10.3133/ofr8794},
  url = {https://pubs.usgs.gov/publication/ofr8794},
  note = {Source identifier: ofr8794}
}