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Déctor, A.; Morales-Técotl, H. A.; Urrutia, L. F.; Vergara, J. D. An alternative canonical approach to the ghost problem in a complexified extension of the Pais-Uhlenbeck oscillator. (English) Zbl 1208.81111 SIGMA, Symmetry Integrability Geom. Methods Appl. 5, Paper 053, 22 p. (2009). MSC: 81R12 70H15 37J15 PDFBibTeX XMLCite \textit{A. Déctor} et al., SIGMA, Symmetry Integrability Geom. Methods Appl. 5, Paper 053, 22 p. (2009; Zbl 1208.81111) Full Text: DOI arXiv EuDML
Urrutia, L. F.; Zanelli, J. Local supersymmetry in nonrelativistic systems. (English) Zbl 0850.70188 J. Math. Phys. 31, No. 9, 2271-2277 (1990). MSC: 70H33 PDFBibTeX XMLCite \textit{L. F. Urrutia} and \textit{J. Zanelli}, J. Math. Phys. 31, No. 9, 2271--2277 (1990; Zbl 0850.70188) Full Text: DOI
Urrutia, L. F.; Manterola, C. Propagator for anisotropic three-dimensional charged harmonic oscillator in a constant magnetic field using the Schwinger action principle. (English) Zbl 0617.70022 Int. J. Theor. Phys. 25, 75-88 (1986). Reviewer: P.Achuthan MSC: 70H99 81Q99 78A35 81V10 PDFBibTeX XMLCite \textit{L. F. Urrutia} and \textit{C. Manterola}, Int. J. Theor. Phys. 25, 75--88 (1986; Zbl 0617.70022) Full Text: DOI
Hojman, Sergio; Urrutia, Luis F. On the inverse problem of the calculus of variations. (English) Zbl 0475.70023 J. Math. Phys. 22, 1896-1903 (1981). MSC: 70H03 37J99 49S05 70G10 PDFBibTeX XMLCite \textit{S. Hojman} and \textit{L. F. Urrutia}, J. Math. Phys. 22, 1896--1903 (1981; Zbl 0475.70023) Full Text: DOI