1. Beretta, E. and F. Solimano. 1985. “A Generalization of Integro-differential Volterra Models in Population Dynamics: Boundedness and Global Asymptotic Stability.” To apper inSIAM J. appl. Math.
2. Beretta, E. and Y. Takeuchi. 1986. “Global Asymptotic Stability of Lotka-Volterra Diffusion Models with Continuous Time Delay.” To appear inSIAM J. appl. Math.
3. Berman, A. and R. J. Plemmons. 1979.Non-negative Matrices in the Mathematical Sciences. New York: Academic Press.
4. Lect. Notes in Biomath.;J. M. Cushing,1977
5. D'Ancona, U. 1954.The Struggle for Existence. Leiden, Netherlands: E. J. Brill.