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Publications in Math-Net.Ru |
Citations |
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2020 |
| 1. |
Pierre Bérard, Bernard Helffer, “Sturm's theorem on the zeros of sums of eigenfunctions: Gelfand's strategy implemented”, Mosc. Math. J., 20:1 (2020), 1–25    |
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2015 |
| 2. |
Bernard Helffer, Mikael Persson Sundqvist, “Nodal domains in the square – the Neumann case”, Mosc. Math. J., 15:3 (2015), 455–495  |
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2008 |
| 3. |
Yu. A. Kordyukov, B. Helffer, “Periodic Magnetic Schrödinger Operators: Spectral Gaps and Tunneling Effect”, Trudy Mat. Inst. Steklova, 261 (2008), 176–187   ; Proc. Steklov Inst. Math., 261 (2008), 171–182 |
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2007 |
| 4. |
B. Helffer, T. Hoffmann-Ostenhof, “Converse spectral problems for nodal domains”, Mosc. Math. J., 7:1 (2007), 67–84 |
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2004 |
| 5. |
B.Helffer, D. Robert, X. P. Wang, “Semiclassical analysis of a nonlinear eigenvalue problem and nonanalytic hypoellipticity”, Algebra i Analiz, 16:1 (2004), 320–334 ; St. Petersburg Math. J., 16:1 (2005), 285–296 |
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2003 |
| 6. |
B. Helffer, T. Hoffmann-Ostenhof, N. S. Nadirashvili, “Periodic Schrödinger operators and Aharonov–Bohm Hamiltonians”, Mosc. Math. J., 3:1 (2003), 45–61 |
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1996 |
| 7. |
B. Helffer, “Correlation decay and gap of the transfer operator”, Algebra i Analiz, 8:1 (1996), 192–210 ; St. Petersburg Math. J., 8:1 (1997), 149–163 |
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