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@article{AM2_1975__12_136512, author = {Gregory Walter Horndeski}, title = {Sufficiency {Conditions} {Under} {Which} a {Lagrangian} is an {Ordinary} {Divergence.}}, journal = {Aequationes mathematicae}, pages = {232--241}, publisher = {mathdoc}, volume = {12}, year = {1975}, zbl = {0311.49030}, url = {http://geodesic.mathdoc.fr/item/AM2_1975__12_136512/} }
Gregory Walter Horndeski. Sufficiency Conditions Under Which a Lagrangian is an Ordinary Divergence.. Aequationes mathematicae, Tome 12 (1975), pp. 232-241. http://geodesic.mathdoc.fr/item/AM2_1975__12_136512/