Rassias, John M. On the stability of the Euler-Lagrange functional equation. (English) Zbl 0753.39003 Chin. J. Math. 20, No. 2, 185-190 (1992). Reviewer: B.Crstici (Timişoara) MSC: 39B52 39B72 PDFBibTeX XMLCite \textit{J. M. Rassias}, Chin. J. Math. 20, No. 2, 185--190 (1992; Zbl 0753.39003)
Fishman, L. Z. Stability conditions for a fixed point of point maps in the critical case of a pair of complex conjugate roots on the unit circle. (English. Russian original) Zbl 0801.34047 Math. Notes 52, No. 6, 1265-1271 (1992); translation from Mat. Zametki 52, No. 6, 131-139 (1992). MSC: 34D08 65J99 34C05 39A12 PDFBibTeX XMLCite \textit{L. Z. Fishman}, Math. Notes 52, No. 6, 1 (1992; Zbl 0801.34047); translation from Mat. Zametki 52, No. 6, 131--139 (1992) Full Text: DOI
Deift, Percy; Li, Luen-Chau; Tomei, Carlos Loop groups, discrete versions of some classical integrable systems, and rank 2 extensions. (English) Zbl 0770.34005 Mem. Am. Math. Soc. 479, 101 p. (1992). Reviewer: Li Jibin (Kunming) MSC: 34A25 15A24 39A10 37J35 37K10 70H03 34-01 58-01 PDFBibTeX XMLCite \textit{P. Deift} et al., Loop groups, discrete versions of some classical integrable systems, and rank 2 extensions. Providence, RI: American Mathematical Society (AMS) (1992; Zbl 0770.34005) Full Text: DOI