1. Stability and scillation in delay differential equations of population dynamics;Gopalsamy,1992
2. Delay differential equations with application dynamic;Kuang,1988
3. Stability in models of mutualism;Goh;Amer Nat,1979
4. Persistence, attractivity, and delay in facultative mutualism;Gopalsamy;J Math Anal Appl,1997
5. Existence of positive solution of multidelays facultative mutualism system;Yang;J Eng Math,2002