Pierre Bérard, Bernard Helffer, Springer Proceedings in Mathematics & Statistics, 348, Schrödinger Operators, Spectral Analysis and Number Theory, 2021, 47
Pierre Bérard, Bernard Helffer, “Level sets of certain Neumann eigenfunctions under deformation of Lipschitz domains Application to the Extended Courant Property”, Annales de la Faculté des sciences de Toulouse : Mathématiques, 30:3 (2021), 429
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
Steinerberger S., “A Metric Sturm-Liouville Theory in Two Dimensions”, Calc. Var. Partial Differ. Equ., 59:1 (2020), 12
Berard P., Helffer B., “Sturm'S Theorem on Zeros of Linear Combinations of Eigenfunctions”, Expo. Math., 38:1 (2020), 27–50
Buhovsky L., Logunov A., Sodin M., “Eigenfunctions With Infinitely Many Isolated Critical Points”, Int. Math. Res. Notices, 2020:24 (2020), 10100–10113
Berard P., Helffer B., “On Courant'S Nodal Domain Property For Linear Combinations of Eigenfunctions. Part i”, Doc. Math., 23 (2018), 1561–1585
Jain S.R., Samajdar R., “Nodal Portraits of Quantum Billiards: Domains, Lines, and Statistics”, Rev. Mod. Phys., 89:4 (2017), 045005
Helffer B., Kiwan R., “Dirichlet Eigenfunctions in the Cube, Sharpening the Courant Nodal Inequality”, Functional Analysis and Operator Theory For Quantum Physics: the Pavel Exner Anniversary Volume, EMS Ser. Congr. Rep., eds. Dittrich J., Kovarik H., Laptev A., Eur. Math. Soc., 2017, 353–371
Pierre Bérard, Bernard Helffer, “Nodal sets of eigenfunctions, Antonie Stern's results revisited”, Séminaire de théorie spectrale et géométrie, 32 (2015), 1