Geodesic
On construction of symmetries from integrals of hyperbolic partial differential systems
Fundamentalʹnaâ i prikladnaâ matematika, Tome 10 (2004) no. 1, pp. 29-37 Cet article a éte moissonné depuis la source Math-Net.Ru

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An algorithm is proposed which allows one to construct higher symmetries of arbitrary order for some special classes of hyperbolic systems possessing the integrals. The Pohlmeyer–Lund–Regge system and the open two-dimensional Toda lattices are shown to belong to the class of systems such that our algorithm is applicable. 
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D. K. Demskoi; S. Ya. Startsev. On construction of symmetries from integrals of hyperbolic partial differential systems. Fundamentalʹnaâ i prikladnaâ matematika, Tome 10 (2004) no. 1, pp. 29-37. http://geodesic.mathdoc.fr/item/FPM_2004_10_1_a3/

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