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@article{AM2_1973__9_136348, author = {JOHN DAVID LOGAN}, title = {First {Integrals} in the {Discrete} {Variational} {Calculus}}, journal = {Aequationes mathematicae}, pages = {210--220}, publisher = {mathdoc}, volume = {9}, year = {1973}, zbl = {0268.49022}, url = {http://geodesic.mathdoc.fr/item/AM2_1973__9_136348/} }
JOHN DAVID LOGAN. First Integrals in the Discrete Variational Calculus. Aequationes mathematicae, Tome 9 (1973), pp. 210-220. http://geodesic.mathdoc.fr/item/AM2_1973__9_136348/