The generalized faro shuffle. - S. Brent Morris; Robert E. Hartwig (Discret. Math., 1976)

Applications of the Drazin Inverse to the Hill Cryptographic System. Part I. - Jack Levine; Robert E. Hartwig (Cryptologia, 1980)

Applications of the Drazin Inverse to the Hill Cryptographic System. Part II. - Jack Levine; Robert E. Hartwig (Cryptologia, 1980)

Applications of the Drazin Inverse to the Hill Cryptographic System. Part IV. - Robert E. Hartwig; Jack Levine (Cryptologia, 1981)

Applications of the Drazin Inverse to the Hill Cryptographic System. Part III. - Robert E. Hartwig; Jack Levine (Cryptologia, 1981)

Duality and Black Box Interpolation I: The One Variable Nonderogatory Case. - Vaidyanath Mani; Robert E. Hartwig (SIAM J. Matrix Anal. Appl., 1995)

Computing the Moore-Penrose Inverse for the Covariance Matrix in Constrained Nonlinear Estimation. - Wolfgang M. Hartmann; Robert E. Hartwig (SIAM J. Optim., 1996)

Power Additivity and Orthogonality. - Robert E. Hartwig; Peter Semrl (SIAM J. Matrix Anal. Appl., 1998)

Mathematics for demosaicking. - H. Joel Trussell; Robert E. Hartwig (IEEE Trans. Image Process., 2002)

Super-resolution of interleaved sampled signals. - Derek H. Justice; H. Joel Trussell; Robert E. Hartwig (ICASSP (6), 2003)

The semi-iterative method applied to the hyper-power iteration. - Xuzhou Chen; Robert E. Hartwig (Numer. Linear Algebra Appl., 2005)

Note on a Linear Difference Equation. - Robert E. Hartwig (Am. Math. Mon., 2006)

The Conditions for the Convergence of Power Scaled Matrices and Applications. - Xuzhou Chen; Robert E. Hartwig (Am. J. Comput. Math., 2011)