Geodesic
Helmholtz potentiality conditions for systems of difference-differential equations
Matematičeskie zametki, Tome 64 (1998) no. 3, pp. 437-442.

Voir la notice de l'article provenant de la source Math-Net.Ru

For operators corresponding to systems of $\mu$th-order difference-differential equations of neutral type, necessary and sufficient conditions for potentiality with respect to the classical bilinear form are obtained. These results are applied to first-order quasilinear systems. 
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A. M. Popov. Helmholtz potentiality conditions for systems of difference-differential equations. Matematičeskie zametki, Tome 64 (1998) no. 3, pp. 437-442. http://geodesic.mathdoc.fr/item/MZM_1998_64_3_a12/

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