Strong instability of solitary waves for nonlinear Klein-Gordon equations and generalized Boussinesq equations
Annales de l'I.H.P. Analyse non linéaire, Tome 24 (2007) no. 4, pp. 539-548. 
@article{AIHPC_2007__24_4_539_0,
     author = {Liu, Yue and Ohta, Masahito and Todorova, Grozdena},
     title = {Strong instability of solitary waves for nonlinear {Klein-Gordon} equations and generalized {Boussinesq} equations},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {539--548},
     publisher = {Elsevier},
     volume = {24},
     number = {4},
     year = {2007},
     doi = {10.1016/j.anihpc.2006.03.005},
     zbl = {1120.35013},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.anihpc.2006.03.005/}
}
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Liu, Yue; Ohta, Masahito; Todorova, Grozdena. Strong instability of solitary waves for nonlinear Klein-Gordon equations and generalized Boussinesq equations. Annales de l'I.H.P. Analyse non linéaire, Tome 24 (2007) no. 4, pp. 539-548. doi : 10.1016/j.anihpc.2006.03.005. http://www.numdam.org/articles/10.1016/j.anihpc.2006.03.005/

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