Geodesic
Necessary and sufficient conditions for the existence of symmetry groups for systems of differential-difference equations with partial derivatives
Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 37 (2010), pp. 5-15.

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In the present paper, we obtain necessary and sufficient conditions for the existence of symmetry groups for systems of differential-difference equations with partial derivatives. Constructions of symmetry groups and recursion operators for various differential-difference equations are described. The corresponding symmetry generators that transform solutions of given equations into other solutions are obtained. 
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     title = {Necessary and sufficient conditions for the existence of symmetry groups for systems of differential-difference equations with partial derivatives},
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I. A. Kolesnikova. Necessary and sufficient conditions for the existence of symmetry groups for systems of differential-difference equations with partial derivatives. Contemporary Mathematics. Fundamental Directions, Proceedings of the Crimean autumn mathematical school-symposium, Tome 37 (2010), pp. 5-15. http://geodesic.mathdoc.fr/item/CMFD_2010_37_a0/

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