no. 1
Nonzero time periodic solutions to an equation of Petrovsky type with nonlinear boundary conditions : slow oscillations of beams on elastic bearings
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 1, pp. 133-146. 
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     author = {Feireisl, Eduard},
     title = {Nonzero time periodic solutions to an equation of {Petrovsky} type with nonlinear boundary conditions : slow oscillations of beams on elastic bearings},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {133--146},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 20},
     number = {1},
     year = {1993},
     mrnumber = {1216001},
     zbl = {0794.73029},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1993_4_20_1_133_0/}
}
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Feireisl, Eduard. Nonzero time periodic solutions to an equation of Petrovsky type with nonlinear boundary conditions : slow oscillations of beams on elastic bearings. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 20 (1993) no. 1, pp. 133-146. http://archive.numdam.org/item/ASNSP_1993_4_20_1_133_0/

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