Helffer Bernard

Publications in Math-Net.Ru

1. Sturm's theorem on the zeros of sums of eigenfunctions: Gelfand's strategy implemented
   
   Mosc. Math. J., 20:1 (2020),  1–25
2. Nodal domains in the square – the Neumann case
   
   Mosc. Math. J., 15:3 (2015),  455–495
3. Periodic Magnetic Schrödinger Operators: Spectral Gaps and Tunneling Effect
   
   Trudy Mat. Inst. Steklova, 261 (2008),  176–187
4. Converse spectral problems for nodal domains
   
   Mosc. Math. J., 7:1 (2007),  67–84
5. Semiclassical analysis of a nonlinear eigenvalue problem and nonanalytic hypoellipticity
   
   Algebra i Analiz, 16:1 (2004),  320–334
6. Periodic Schrödinger operators and Aharonov–Bohm Hamiltonians
   
   Mosc. Math. J., 3:1 (2003),  45–61
7. Correlation decay and gap of the transfer operator
   
   Algebra i Analiz, 8:1 (1996),  192–210