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The Euler-Lagrange resolution. (English) Zbl 0456.58012
Differential geometrical methods in mathematical physics, Proc. Conf. Aix-en-Provence and Salamanca 1979, Lect. Notes Math. 836, 22-48 (1980).

58E15 Variational problems concerning extremal problems in several variables; Yang-Mills functionals
58A10 Differential forms in global analysis
58A20 Jets in global analysis
55R10 Fiber bundles in algebraic topology
49Q99 Manifolds and measure-geometric topics