1. Logistic growth rate functions;Blumberg;J. Theor. Biol.,1968
2. Mathematical Models in Population Biology and Epidemiology;Brauer,2001
3. Mathematical Bioeconomics, the Optimal Management of Renewable Resources;Clark,1990
4. Bifurcation, perturbation of simple eigenvalues and linearized stability;Crandall;Arch. Ration. Mech. Anal.,1973
5. Exact multiplicity of positive solutions in semipositone problems with concave-convex type nonlinearities;Gadam;Electron. J. Qual. Theory Differ. Equ.,2001