@misc{indiciae8e38ed9f8ac5,
  title = {A single-degree-of-freedom model for non-linear soil amplification},
  author = {Mustafa Ozder Erdik},
  year = {1979},
  doi = {10.3133/ofr79592},
  url = {https://pubs.usgs.gov/publication/ofr79592},
  note = {Source identifier: ofr79592}
}