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@article{ARM_1982__18_4_a6, author = {Chrastina, Jan}, title = {Another approach to the classical calculus of variations. {I}}, journal = {Archivum mathematicum}, pages = {205--218}, publisher = {mathdoc}, volume = {18}, number = {4}, year = {1982}, mrnumber = {685806}, zbl = {0496.58005}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1982__18_4_a6/} }
Chrastina, Jan. Another approach to the classical calculus of variations. I. Archivum mathematicum, Tome 18 (1982) no. 4, pp. 205-218. http://geodesic.mathdoc.fr/item/ARM_1982__18_4_a6/