1. Population growth in random environments;Brauman;Bull. Math. Biol.,1983
2. Effect of toxic substances on a two species competitive system;Chattopadhyay;Ecol. Model.,1996
3. Stochastic Differential Equations and Their Applications, vol. 1;Freedman,1976
4. Models for the effect of toxicant in single-species and predator–prey systems;Freedman;J. Math. Biol.,1991
5. Partial Differential Equation of Parabolic Type;Friedman,1964