1 "Solubility of the systemAx =0 x≥0 with indenitecoecients" 108-112, 1990
2 "Sign consistency and solvability of constrained linear systems" 4 : 1-18, 1998
3 "A note on sign central matrices" 10 (10): 353-360, 2002
4 "A characterization of nearly sign central matrices" -778,
1 "Solubility of the systemAx =0 x≥0 with indenitecoecients" 108-112, 1990
2 "Sign consistency and solvability of constrained linear systems" 4 : 1-18, 1998
3 "A note on sign central matrices" 10 (10): 353-360, 2002
4 "A characterization of nearly sign central matrices" -778,