1. [1] Bérard, Pierre; Helffer, Bernard The weak Pleijel theorem with geometric control, J. Spectr. Theory, Volume 6 (2016) no. 4, pp. 717-733
2. [2] Bérard, Pierre; Meyer, Daniel Inégalités isopérimétriques et applications, Ann. Sci. Éc. Norm. Supér., Volume 15 (1982) no. 3, pp. 513-541
3. [3] Van Den Berg, Michiel; Gittins, Katie On the number of Courant-sharp Dirichlet eigenvalues, J. Spectr. Theory, Volume 6 (2016) no. 4, pp. 735-745
4. [4] Bonnaillie-Noël, Virginie; Helffer, Bernard Nodal and spectral minimal partitions – the state of the art in 2016, Shape optimization and spectral theory, De Gruyter (2017), pp. 353-397
5. [5] Bourgain, Jean On Pleijel’s nodal domain theorem, Int. Math. Res. Not. (2015) no. 6, pp. 1601-1612