1. Bahl, C. A., Cain, B. E.: The inertia of diagonal multiples of 3×3 real matrices. Lin. Alg. and its Appl. 18, 267–280 (1977)
2. Clark, C. E., Hallam, T. G.: Exploitative competitive community models at equilibrium (in preparation)
3. DeAngelis, D., Post, W. M., III, Travis, C. C.: Positive feedback in natural systems (submitted to Academic Press)
4. Fiedler, M., Ptak, V.: Diagonally dominant matrices. Czech. Math. J. 17, 420–433 (1967)
5. Gause, G. F.: The struggle for existence. New York: Hafner (1934)