Geodesic
Periodic solutions of the equation $u_{tt}-u_{xx}+u^3=0$
Funkcionalʹnyj analiz i ego priloženiâ, Tome 22 (1988) no. 4, pp. 88-89 
B. V. Lidskii; E. I. Shulman. Periodic solutions of the equation $u_{tt}-u_{xx}+u^3=0$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 22 (1988) no. 4, pp. 88-89. http://geodesic.mathdoc.fr/item/FAA_1988_22_4_a15/
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     title = {Periodic solutions of the equation $u_{tt}-u_{xx}+u^3=0$},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
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     volume = {22},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1988_22_4_a15/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

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