Lin X, van den Driessche P
Department of Mathematics, University of Alberta, Edmonton, Canada.
J Math Biol. 1992;30(6):647-54.
A threshold parameter R0 is identified for an SIRS epidemiological model which has nonlinear incidence and a distributed delay for transfer out of the removed class. For R0 less than 1, the disease free equilibrium is proved to be the global attractor for all solutions.