Ripa, P. Stability and instability. I. use of integrals of motion in the stability problem. (English) Zbl 1291.70064 Rev. Mex. Fís. 46, No. 5, 500-506 (2000). MSC: 70H14 37N05 34D35 PDFBibTeX XMLCite \textit{P. Ripa}, Rev. Mex. Fís. 46, No. 5, 500--506 (2000; Zbl 1291.70064)
Ripa, P. Singular Hamiltonian systems. I. Formulation of the discrete case, Noether theorem. (English) Zbl 1291.37111 Rev. Mex. Fís. 38, No. 6, 984-1004 (1992). MSC: 37N05 70H05 70H33 PDFBibTeX XMLCite \textit{P. Ripa}, Rev. Mex. Fís. 38, No. 6, 984--1004 (1992; Zbl 1291.37111)
Ripa, P. A tale of three theorems. (Spanish. English summary) Zbl 1291.37110 Rev. Mex. Fís. 38, No. 2, 229-242 (1992). MSC: 37N05 37N10 70H05 70H33 76E99 PDFBibTeX XMLCite \textit{P. Ripa}, Rev. Mex. Fís. 38, No. 2, 229--242 (1992; Zbl 1291.37110)