@article{EJDE_2007__2007__a169,
     author = {Liu, Li and Li, Xiangao and Zhuang, Kejun},
     title = {Bifurcation analysis on a delayed {SIS} epidemic model with stage structure},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2007},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2007__2007__a169/}
}