1. Characterization of M-Matrices via ABS Methods and its Application to Input-Output Analysis;Abaffy;Quaderni del Dipartimento di Matematica, Statistica, Informatica e Applicazioni,1991
2. Criteria for Transforming a Z-matrix into an M-matrix;Abaffy;Quaderni del Dipartimento di Matematica, Statistica, Informatica e Applicazioni,1991
3. A class of direct methods for linear systems;Abaffy;Numer. Math.,1984
4. On solving sparse band systems with three algorithms of the ABS family;Abaffy;J. Optimiz. Theory Appl.,1991
5. The ABS Projection Algorithm: Mathematical Techniques for Linear and Non Linear Systems;Abaffy,1989