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• Singh, R. K.; Smith, H. A.
  Vibration Analysis of Skeletal Systems Using a Mixed Formulation with an Arnoldi-Based Nonlinear Eigensolution Technique.
  National Science Foundation, Washington, DC., December 1993, 192 p.
  Keywords: ; Eigenvalues; Dynamic response; Vibration mode; Earthquake engineering; Structural vibration; Matrices (Mathematics); Finite element method; Vibration damping; Degrees of freedom; Resonant frequency; Structural analysis; Algorithms; Nonlinear systems

• Igusa, T.; Der Kiureghian, A.
  Dynamic Analysis of Multiply Tuned and Arbitrarily Supported Secondary Systems.
  National Science Foundation, Washington, DC., July 1983, 240 p.
  Identifying Number(s): UCB/EERC-83/07
  Keywords: Dynamic response; Eigenvalues; Damping; Buildings; Earthquake engineering; Earthquakes; Frequency response; Substructures; Degrees of freedom; Approximation; Perturbation; Building subsystems