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• 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: A map associated to the Lepagian forms on the calculus of variations in fibred manifolds. (English). Czechoslovak Mathematical Journal, vol. 27 (1977), issue 1, pp. 114-117,118