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49Q99 None of the above, but in this section (5 articles)

• Brajerčík, Ján: Invariant variational problems on principal bundles and conservation laws. (English). Archivum Mathematicum, vol. 47 (2011), issue 5, pp. 357-366
• Krupka, Demeter: Geometry of Lagrangean structures. 3. (English). In: Frolík, Z., Souček, V. and Fabián, M. (eds.): Proceedings of the 14th Winter School on Abstract Analysis. Circolo Matematico di Palermo, Palermo, 1987. pp. [187]-224
• Krupka, Demeter: Geometry of Lagrangean structures. I. (English). Archivum Mathematicum, vol. 22 (1986), issue 3, pp. 159-173
• Krupka, Demeter: On a class of variational problems defined by polynomial Lagrangians. (English). Archivum Mathematicum, vol. 12 (1976), issue 2, pp. 99-105
• Krupka, Demeter: Of the structure of the Euler mapping. (English). Archivum Mathematicum, vol. 10 (1974), issue 1, pp. 55-61