Geodesic
Local and nonlocal currents for nonlinear equations
Teoretičeskaâ i matematičeskaâ fizika, Tome 62 (1985) no. 1, pp. 3-29

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A general method is suggested for constructing conserving currents for a wide class of (many-dimensional) nonlinear equations. For nonlinear differential equations which can be presented as conditions of solvability of some over-determined linear system with a parameter (in particular, for the equations integrable by means of the inverse scattering transform method), the procedure of the explicit evaluation of conserving currents is proposed. 
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     author = {V. S. Vladimirov and I. V. Volovich},
     title = {Local and nonlocal currents for nonlinear equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_62_1_a0/}
}
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V. S. Vladimirov; I. V. Volovich. Local and nonlocal currents for nonlinear equations. Teoretičeskaâ i matematičeskaâ fizika, Tome 62 (1985) no. 1, pp. 3-29. http://geodesic.mathdoc.fr/item/TMF_1985_62_1_a0/