@conference{55886,
  author = {Kevin Wong and John Harris},
  title = {NONLINEAR MODAL ANALYSIS AND SUPERPOSITION},
  year = {2010},
  month = {2010-07-25},
  publisher = {9th US National and 10th Canadian Conference on Earthquake Engineering: Reaching Beyond Borders, Toronto, -1},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903563},
  language = {en},
}