共 50 条
- [34] THE REGULARIZATION METHOD FOR SINGULARLY PERTURBED SYSTEMS OF NON-LINEAR DIFFERENTIAL-EQUATIONS MATHEMATICS OF THE USSR-IZVESTIYA, 1980, 14 (03): : 571 - 596
- [35] SYMMETRIES AND DIFFERENTIAL-EQUATIONS JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1981, 14 (08): : 1893 - 1914