1. Nonnegative Matrices in the Mathematical Sciences;Berman,1979
2. D. Carlson and T.L. Markham, Products of inverses of M-matrices, working paper.
3. Classes of products of M-matrices and inverse M-matrices;Fiedler;Linear Algebra Appl.,1983
4. Inverse M-matrices;Johnson;Linear Algebra Appl.,1982
5. Totally nonnegative, M-, and Jacobi Matrices;Lewin;SIAM J. Algebraic Discrete Methods,1980