@misc{indiciaeee34274b6537,
  title = {Multi-component ground motion response spectra for coupled horizontal, vertical, angular accelerations, and tilt},
  author = {E. Kalkan and V. Graizer},
  year = {2007},
  url = {https://pubs.usgs.gov/publication/70033217},
  note = {Source identifier: 70033217}
}