1. 1Gantmacher, F. R., Theory of Matrices, Vol.1, Chelsea,New York, 1974, Chap. 10, pp.326-330.
2. 2Sokolnikoff, L. S., Mathematical Theory of Elasticity, McGraw-Hill, New York, 1956, Chap. 3, pp.82-91.
3. 3Kailath, T., Linear Systems, Prentice-Hall, Englewood Cliffs, NJ, 1980, Chap. 2, pp.31-186.
4. Technique for Unique Optimization of Dynamic Finite Element Models