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@article{ARM_1982__18_1_a1, author = {Chrastina, Jan}, title = {Inverse problem of the classical calculus of variations}, journal = {Archivum mathematicum}, pages = {9--14}, publisher = {mathdoc}, volume = {18}, number = {1}, year = {1982}, mrnumber = {683340}, zbl = {0496.58006}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1982__18_1_a1/} }
Chrastina, Jan. Inverse problem of the classical calculus of variations. Archivum mathematicum, Tome 18 (1982) no. 1, pp. 9-14. http://geodesic.mathdoc.fr/item/ARM_1982__18_1_a1/