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MUSILOVÁ, Jana a Michael KRBEK. A note to the representation of the variational sequence in mechanics. In Differential geometry and its Applications, Proc. VII-th Internat. Conf. 1. vyd. Brno: Masaryk University, 1999, s. 511-523. ISBN 80-210-2097-0.Podrobněji: https://is.muni.cz/publication/223812/cs