1. Arias A (1969), “A Measure of Earthquake Intensity in Seismic Design for Nuclear Power Plants,” Ed. By R. Hansen, Massachusetts Institute of Technology, Cambridge.
2. Bolt BA (1973) “Duration of strong ground motion,” Proceedings of the Fifth World Conference on Earthquake Engineering, Rome, Italy, 1, 6-D, Paper No. 292.
3. Bozorgnia Y, Niazi M and Campbell KW (1995), “Characteristics of Free-field Vertical Ground Motion During the Northridge Earthquake,” Earthquake Spectra, 11 (4): 515–525.
4. Bozorgnia Y, Niazi M and Campbell KW (1996), “Relationship Between Vertical and Horizontal Response Spectra for the Northridge Earthquake,” Eleventh World Conference on Earthquake Engineering, Mexico, Paper No. 893.
5. Canadian Dam Association — CDA (1997), Dam Safety Guidelines, Edmonton, Alberta, Canada.