Second order nonpersistence of the sine Gordon breather under an exceptional perturbation
Annales de l'I.H.P. Analyse non linéaire, Tome 12 (1995) no. 2, pp. 201-239. 
@article{AIHPC_1995__12_2_201_0,
     author = {Denzler, Jochen},
     title = {Second order nonpersistence of the sine {Gordon} breather under an exceptional perturbation},
     journal = {Annales de l'I.H.P. Analyse non lin\'eaire},
     pages = {201--239},
     publisher = {Gauthier-Villars},
     volume = {12},
     number = {2},
     year = {1995},
     mrnumber = {1326668},
     zbl = {0842.35102},
     language = {en},
     url = {http://www.numdam.org/item/AIHPC_1995__12_2_201_0/}
}
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Denzler, Jochen. Second order nonpersistence of the sine Gordon breather under an exceptional perturbation. Annales de l'I.H.P. Analyse non linéaire, Tome 12 (1995) no. 2, pp. 201-239. http://www.numdam.org/item/AIHPC_1995__12_2_201_0/

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