%0 Journal Article %A Shang, Yilun %T A Lie algebra approach to susceptible-infected-susceptible epidemics %J Electronic Journal of Differential Equations %D 2012 %V 2012 %I mathdoc %U http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a7/ %G en %F EJDE_2012__2012__a7