Geodesic
Hyperbolic equations with third-order symmetries
Teoretičeskaâ i matematičeskaâ fizika, Tome 166 (2011) no. 1, pp. 51-67

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We present a complete list of nonlinear one-field hyperbolic equations with integrable third-order $x$ and $y$ symmetries. The list includes both equations of the sine-Gordon type and equations linearizable by differential substitutions.
Keywords: higher symmetry
Mots-clés : sine-Gordon type equation, Liouville-type equation. 
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     author = {A. G. Meshkov and V. V. Sokolov},
     title = {Hyperbolic equations with third-order symmetries},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     url = {http://geodesic.mathdoc.fr/item/TMF_2011_166_1_a3/}
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A. G. Meshkov; V. V. Sokolov. Hyperbolic equations with third-order symmetries. Teoretičeskaâ i matematičeskaâ fizika, Tome 166 (2011) no. 1, pp. 51-67. http://geodesic.mathdoc.fr/item/TMF_2011_166_1_a3/