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Publications in Math-Net.Ru |
Citations |
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2023 |
1. |
Cristina Bujac, Dana Schlomiuk, Nicolae Vulpe, “The bifurcation diagram of the configurations of invariant lines of total multiplicity exactly three in quadratic vector fields”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2023, no. 1, 42–77 |
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2019 |
2. |
Dana Schlomiuk, Nicolae Vulpe, “The topological classification of a family of quadratic differential systems in terms of affine invariant polynomials”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2019, no. 2, 41–55 |
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2013 |
3. |
J. C. Artés, J. Llibre, D. Schlomiuk, N. Vulpe, “Geometric configurations of singularities for quadratic differential systems with total finite multiplicity lower than 2”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2013, no. 1, 72–124 |
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2009 |
4. |
N. Gherstega, V. Orlov, N. Vulpe, “A complete classification of quadratic differential systems according to the dimensions of $Aff(2,\mathbb R)$-orbits”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2009, no. 2, 29–54 |
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2008 |
5. |
Dana Schlomiuk, Nicolae Vulpe, “Integrals and phase portraits of planar quadratic differential systems with invariant lines of total multiplicity four”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2008, no. 1, 27–83 |
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2003 |
6. |
Mircea Lupan, Nicolae Vulpe, “Classification of quadratic systems with a symmetry center and simple infinite singular points”, Bul. Acad. Ştiinţe Repub. Mold. Mat., 2003, no. 1, 102–119 |
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1998 |
7. |
Yu. F. Kalin, N. I. Vulpe, “Affine-invariant conditions for the topological discrimination of quadratic Hamiltonian differential systems”, Differ. Uravn., 34:3 (1998), 298–302 ; Differ. Equ., 34:3 (1998), 297–301 |
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1993 |
8. |
N. I. Vulpe, I. V. Nikolaev, “Topological classification of a quadratic system with a four-fold singular point”, Differ. Uravn., 29:10 (1993), 1669–1674 ; Differ. Equ., 29:10 (1993), 1449–1453 |
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1992 |
9. |
V. A. Baltag, N. I. Vulpe, “The number and multiplicity of singular points of a quadratic
differential system”, Dokl. Akad. Nauk, 323:1 (1992), 9–12 ; Dokl. Math., 45:2 (1992), 235–238 |
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1991 |
10. |
N. I. Vulpe, “Coefficient conditions for the number and multiplicity of singular points of a quadratic differential system”, Differ. Uravn., 27:4 (1991), 572–577 ; Differ. Equ., 27:4 (1991), 397–398 |
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1990 |
11. |
D. Bularas, N. I. Vulpe, K. S. Sibirskii, “The problem of the center “in the large” for a general quadratic
system”, Dokl. Akad. Nauk SSSR, 311:4 (1990), 777–780 ; Dokl. Math., 41:2 (1990), 287–290 |
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1989 |
12. |
Bularas Driss, N. I. Vulpe, K. S. Sibirskii, “Solution of a problem of the center “in the large” for a general quadratic differential system”, Differ. Uravn., 25:11 (1989), 1856–1862 ; Differ. Equ., 25:11 (1989), 1294–1299 |
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1988 |
13. |
N. I. Vulpe, K. S. Sibirskii, “Centro-affine invariant conditions for the existence of a center
of a differential system with cubic nonlinearities”, Dokl. Akad. Nauk SSSR, 301:6 (1988), 1297–1301 ; Dokl. Math., 38:1 (1989), 198–201 |
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1983 |
14. |
N. I. Vulpe, “Construction of a minimal complete system of orthogonal invariants for a two-dimensional system of differential equations”, Dokl. Akad. Nauk SSSR, 269:6 (1983), 1299–1302 |
15. |
N. I. Vulpe, “Minimal complete system of orthogonal invariants of a two-dimensional differential system”, Differ. Uravn., 19:4 (1983), 564–569 |
16. |
N. I. Vulpe, “Affine-invariant conditions for topological distinction of quadratic systems in the presence of a center”, Differ. Uravn., 19:3 (1983), 371–379 |
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1981 |
17. |
N. I. Vulpe, “The minimal basis of comitants of a differential system with quadratic nonlinearities”, Differ. Uravn., 17:11 (1981), 1955–1963 |
18. |
N. I. Vulpe, “Polynomial basis of centroaffine comitants of a homogeneous cubic differential system”, Differ. Uravn., 17:9 (1981), 1682–1684 |
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1980 |
19. |
N. I. Vulpe, “A polynomial basis for the centro-affine concomitants of a differential system”, Dokl. Akad. Nauk SSSR, 250:5 (1980), 1033–1037 |
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1979 |
20. |
N. I. Vulpe, “Construction of a polynomial basis of comitants of a differential system”, Differ. Uravn., 15:8 (1979), 1399–1410 |
21. |
N. I. Vulpe, “The number of linearly independent compacta of a system of differential equations”, Differ. Uravn., 15:6 (1979), 963–973 |
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1977 |
22. |
N. I. Vulpe, K. S. Sibirskii, “Geometric classification of a quadratic differential system”, Differ. Uravn., 13:5 (1977), 803–814 |
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1975 |
23. |
N. I. Vulpe, “A minimal polynomial base of the affine invariants of a quadratic system”, Differ. Uravn., 11:5 (1975), 918–920 |
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1974 |
24. |
N. I. Vulpe, K. S. Sibirskii, “Affine classification of a quadratic system”, Differ. Uravn., 10:12 (1974), 2111–2124 |
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1990 |
25. |
A. F. Andreev, V. A. Andrunakievich, N. I. Vulpe, È. I. Grudo, V. M. Millionshchikov, L. A. Cherkas, B. A. Shcherbakov, “Konstantin Sergeevich Sibirskiǐ”, Differ. Uravn., 26:6 (1990), 1098–1100 ; Differ. Equ., 26:6 (1990), 800–802 |
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Organisations |
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