1. G. P. Barker and H. Schneider, Algebraic Perron-Frobenius theory, to appear.
2. Convex cones, sets and functions;Fenchel,1951
3. The Theory of Matrices;Gantmacher,1959
4. Linear Algebra;Greub,1967
5. R. Loewy and H. Schneider, Indecomposable cones, to appear.