Sign-Nonsingular Matrix Pairs. - Richard A. Brualdi; Keith L. Chavey (SIAM J. Matrix Anal. Appl., 1992)

Linear Spaces of Toeplitz and Nilpotent Matrices. - Richard A. Brualdi; Keith L. Chavey (J. Comb. Theory A, 1993)

Bipartite Graphs and Inverse Sign Patterns of Strong Sign-Nonsingular Matrices. - Richard A. Brualdi; Keith L. Chavey; Bryan L. Shader (J. Comb. Theory B, 1994)