Massa, Enrico; Pagani, Enrico On the notion of Jacobi fields in constrained calculus of variations. (English) Zbl 1364.49022 Commun. Math. 24, No. 2, 91-113 (2016). MSC: 49K15 70Q05 PDFBibTeX XMLCite \textit{E. Massa} and \textit{E. Pagani}, Commun. Math. 24, No. 2, 91--113 (2016; Zbl 1364.49022) Full Text: DOI Link
Massa, Enrico; Luria, Gianvittorio; Pagani, Enrico Geometric constrained variational calculus. III: The second variation (part II). (English) Zbl 1345.49026 Int. J. Geom. Methods Mod. Phys. 13, No. 4, Article ID 1650038, 39 p. (2016). MSC: 49K15 93B27 49J99 70F25 PDFBibTeX XMLCite \textit{E. Massa} et al., Int. J. Geom. Methods Mod. Phys. 13, No. 4, Article ID 1650038, 39 p. (2016; Zbl 1345.49026) Full Text: DOI