Large Global Asymptotically Stability of an SEIR Epidemic Model with Distributed Time Delay
An SEIR epidemic transmission model is formulated under the assumption that the force of infection at the present time depends on the number of infectives at the past. It is shown that a desease free equilibrium is globally stable if no epidemic equilibrium point exists. Further the epidemic equilibrium (if it exists) is globally stable in the who;e state space except the neighborhood of the desease free equilibrium.
J. Gao and Z. Jin, "Large Global Asymptotically Stability of an SEIR Epidemic Model with Distributed Time Delay", Advanced Materials Research, Vols. 271-273, pp. 428-434, 2011