no. 2
On global real analytic solutions of the degenerate Kirchhoff equation
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 2, pp. 279-297 
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     title = {On global real analytic solutions of the degenerate {Kirchhoff} equation},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {279--297},
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     number = {2},
     zbl = {0819.35099},
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Kajitani, Kunihiko; Yamaguti, Kaoru. On global real analytic solutions of the degenerate Kirchhoff equation. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 21 (1994) no. 2, pp. 279-297. https://www.numdam.org/item/ASNSP_1994_4_21_2_279_0/

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