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MRÁZ, Martin a Jana MUSILOVÁ. Variational compatibility of force laws. In Differential Geometry and its Applications, Proc. VII-th Internat. Conf. 1. vyd. Brno: Masaryk University, 1999, s. 553-560. ISBN 80-210-2097-0.Podrobněji: https://is.muni.cz/publication/223793/cs