@article{EJDE_2012__2012__a7,
     author = {Shang, Yilun},
     title = {A {Lie} algebra approach to susceptible-infected-susceptible epidemics},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2012},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a7/}
}