@article{EJDE_2006__2006__a134,
     author = {Zhu, Jianmin and Li, Zhixiang and Liu, Yicheng},
     title = {Stable time periodic solutions for damped {sine-Gordon} equations},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {2006},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a134/}
}