1. Guyan RJ (1965) Reduction of stiffness and mass matrices. AIAA J 3(2):380
2. Irons B (1965) Structural eigenvalue problems: elimination of unwanted variables. AIAA J 3(5):961–962
3. O’Callahan JC (1989) A procedure for an improved reduced system (IRS) model. In: Seventh international modal analysis conference, Las Vegas, pp 17–21
4. Freed AM, Flannigan CC (1990) A comparison of test-analysis model reduction methods. In: Eighth international modal analysis conference, Kissimmee, pp 1344–1351
5. Allemang RJ, Brown DL (1982) A correlation coefficient for modal vector analysis. In: First international modal analysis conference, Orlando, pp 110–116