A variational approach to bifurcation into spectral gaps
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 4, pp. 651-674. 
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     author = {Giacomoni, Jacques and Jeanjean, Louis},
     title = {A variational approach to bifurcation into spectral gaps},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {651--674},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 28},
     number = {4},
     year = {1999},
     mrnumber = {1760535},
     zbl = {0961.35032},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1999_4_28_4_651_0/}
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Giacomoni, Jacques; Jeanjean, Louis. A variational approach to bifurcation into spectral gaps. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 28 (1999) no. 4, pp. 651-674. http://www.numdam.org/item/ASNSP_1999_4_28_4_651_0/

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