1. On eigenvalues of matrices dependent on a parameter
2. Perturbations of the eigenvalues and eigenvectors of a network, Proc. 5th Allerton Conf. in Circuit and System, Univ. of Illinois, 1967, pp. 8–11.
3. Methods of Matrix Algebra, Academic Press, New York 1969.
4. Introduction to Matrix Analysis, McGraw-Hill, New York 1970.
5. Perturbation Theory for Linear Operators, Springer, Berlin-Heidelberg-New York 1976.