| 1. |
V. S. Abramov, A. A. Bobodzhanov, M. A. Bobodzhanova, “A method of normal forms for nonlinear singularly perturbed systems in case of intersection of eigenvalues of limit operator”, Izv. Vyssh. Uchebn. Zaved. Mat., 2019, no. 8, 3–12 ; Russian Math. (Iz. VUZ), 63:8 (2019), 1–9 |
1
|