1. Sign-central matrices;Ando;Linear Algebra Appl.,1994
2. Rectangular L-matrices;Brualdi;Linear Algebra Appl.,1994
3. Matrices of Sign-Solvable Linear Systems;Brualdi,1995
4. Sous-monoides d'intersection complete de N;Delorme;Ann. Sci. École Norm. Sup.,1976
5. Solubility of the system Ax = 0, x ⩾ 0 with indefinite coefficients;Davydov;Soviet Math. Izv. VUZ,1990