Geodesic
A new construction of recursion operators for systems of the hydrodynamic type
Teoretičeskaâ i matematičeskaâ fizika, Tome 122 (2000) no. 1, pp. 37-49 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider a certain class of two-dimensional systems of the hydrodynamic type that contains all examples known to us and can be associated with a class of linear wave equations possessing an algebra of ladder operators. We use this to give a simple construction of recursion operators for these systems, not always coinciding with those of Sheftel and Teshukov. 
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A. P. Fordy; T. B. Gürel. A new construction of recursion operators for systems of the hydrodynamic type. Teoretičeskaâ i matematičeskaâ fizika, Tome 122 (2000) no. 1, pp. 37-49. http://geodesic.mathdoc.fr/item/TMF_2000_122_1_a3/

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