A Note on the Computation of Eigenvalues and Vectors of Hermitean Matrices. - Tien Chi Chen; Ralph A. Willoughby (IBM J. Res. Dev., 1958)

An Analysis of the Effect of Component Tolerances on the Amplification of the Balanced-Pair Tunnel-Diode Circuit. - Robert K. Brayton; Ralph A. Willoughby (IEEE Trans. Electron. Comput., 1963)

Special Issue Honoring Alston S. Householder - Editor's Foreword. - Ralph A. Willoughby (Commun. ACM, 1975)

Numerical Mathematics (Günther Hämmerline and Karl-Heinz Hoffman). - Ralph A. Willoughby (SIAM Rev., 1993)

A QL Procedure for Computing the Eigenvalues of Complex Symmetric Tridiagonal Matrices. - Jane K. Cullum; Ralph A. Willoughby (SIAM J. Matrix Anal. Appl., 1996)