Batlle, C.; Gomis, J.; Pons, J. M.; Román-Roy, N. Lagrangian and Hamiltonian constraints for second-order singular Lagrangians. (English) Zbl 0658.70017 J. Phys. A 21, No. 12, 2693-2703 (1988). MSC: 70H05 37J99 PDFBibTeX XMLCite \textit{C. Batlle} et al., J. Phys. A, Math. Gen. 21, No. 12, 2693--2703 (1988; Zbl 0658.70017) Full Text: DOI
Batlle, C.; Gomis, J.; Pons, J. M.; Román-Roy, N. On the Legendre transformation for singular Lagrangians and related topics. (English) Zbl 0642.58029 J. Phys. A 20, 5113-5123 (1987). Reviewer: Yu.E.Gliklikh MSC: 37J99 PDFBibTeX XMLCite \textit{C. Batlle} et al., J. Phys. A, Math. Gen. 20, 5113--5123 (1987; Zbl 0642.58029) Full Text: DOI