1. The iterative calculation of a few of the lowest eigenvalues and corresponding eigenvectors of large real-symmetric matrices
2. 3Schwarz, H. R., Rutishauser, H., and Steifel, E., Numerical Analysis of Symmetric Matrices, Prentice-Hall, Englewood Cliffs, NJ, 1973, pp.63-75.
3. 5Anton, H., and Rorres, C., Elementary Linear Algebra-Applications Version, Wiley, New York, 1994, pp.320, 321.