Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
(a) The bifurcation diagram of model II with 
as a control parameter. (b) The codimension two bifurcation diagram of model II with 
and 
as control parameters. Other parameter values are 
, 
, 
, 
, 
, 
, and 
.
