1. Jane Cullum and W. E. Donath, (1974),A block Lanczos algorithm for computing the q algebraically largest eigenvalues and a corresponding eigenspace of large, sparse, real symmetric matrices, Proceedings of the 1974 IEEE Conference on Decision and Control, Phoenix, Arizona, November 1974, 505–509.
2. Jane Cullum and W. E. Donath, (1974),A block generalization of the symmetric s-step Lanczos algorithm, RC 4845, IBM Research, Yorktown Heights, N.Y.
3. Richard Underwood, (1975),An interative block Lanczos method for the solution of large, sparse symmetric eigenproblems, STAN-CS-75-496, Computer Science Department, Stanford University. Also, Mathematical Software III, ed. J. R. Rice, Academic Press 1977.
4. W. Karush, (1951),An iterative method for finding characteristic vectors of a symmetric matrix, Pacific J. Math., 1, 233–248.
5. Gene H. Golub, Computer Science Dept., Stanford University.