First integrals of difference equations which do not possess a variational formulation

Author： Winternitz P.   Dorodnitsyn V.   Kaptsov E.   Kozlov R.  

Publisher： MAIK Nauka/Interperiodica

ISSN： 1064-5624

Source： Doklady Mathematics, Vol.89, Iss.1, 2014-01, pp. : 106-109

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