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• Nagarajaiah, S.; Reinhorn, A. M.; Constantinou, M. C.
  Nonlinear Dynamic Analysis of Three-Dimensional Base Isolated Structures (3D-BASIS).
  National Science Foundation, Washington, DC., August 3, 1989, 132 p.
  Identifying Number(s): NCEER-89-0019
  Keywords: Dynamic response; Ground motion; Buildings; Earthquake engineering; Earthquake resistant structures; Base isolation; 3D-BASIS computer program; Seismic effects; Nonlinear analysis; Mathematical models

• Nagarajaiaj, S.; Reinhorn, A. M.; Constantinou, M. C.
  3D-BASIS Nonlinear Dynamic Analysis of Three-Dimensional Base Isolated Structures: Part 2.
  National Science Foundation, Washington, DC., February 28, 1991, 146 p.
  Identifying Number(s): NCEER-91-0005
  Keywords: Dynamic response; Bearings; Vibration isolators; Earthquake resistant structures; Earthquake engineering; 3D-BASIS computer program; Structural vibration; Springs (Elastic); Vibration damping; Stiffness; Displacement; Mathematical models; Algorithms; Nonlinear systems; Dynamic structural analysis