P. Bérard and D. Meyer, Inégalités isopérimétriques et applications Annales scientifiques de l' ´ Ecole Normale Supérieure, pp.513-541, 1982.

P. Bérard and B. Helffer, Dirichlet eigenfunctions of the square membrane: Courant's property, and A. Stern's andÅ andÅ. Pleijel's analyses. arXiv:14026054, To appear in Springer Proceedings in Mathematics & Statistics MIMS- GGTM conference in memory of M. S. Baouendi. A. Baklouti, A. El Kacimi, S. Kallel, and N. Mir Editors, 2015.

C. J. Bishop, Some questions concerning harmonic measure Partial Differential equations with minimal smoothness and applications, Math. Appl, pp.42-89, 1992.

R. Courant, Ein allgemeiner Satz zur Theorie der Eigenfunktionen selbstadjungierter Differentialausdrücke, Nachr. Ges. Göttingen, pp.81-84, 1923.

A. Eremenko, D. Jakobson, and N. Nadirashvili, On nodal sets and nodal domains on S 2, Annales Institut Fourier, vol.57, pp.7-2345, 2007.
DOI : 10.5802/aif.2335

S. Friedland and W. K. Hayman, Eigenvalue inequalities for the dirichlet problem on spheres and the growth of subharmonic functions, Commentarii Mathematici Helvetici, vol.51, issue.1, pp.133-161, 1976.
DOI : 10.1007/BF02568147

B. Helffer, T. Hoffmann-ostenhof, and S. Terracini, Nodal domains and spectral minimal partitions, Annales de l'Institut Henri Poincare (C) Non Linear Analysis, vol.26, issue.1, pp.101-138, 2009.
DOI : 10.1016/j.anihpc.2007.07.004
URL : https://hal.archives-ouvertes.fr/hal-00150455

B. Helffer, T. Hoffmann-ostenhof, and S. Terracini, On Spectral Minimal Partitions: the Case of the Sphere, Int. Math. Ser, vol.13, pp.153-178, 2010.
DOI : 10.1007/978-1-4419-1345-6_6

B. Helffer and M. P. Sundqvist, Nodal domains in the square?the Neumann case?. arXiv, pp.1410-6702
URL : https://hal.archives-ouvertes.fr/hal-01435161

V. N. Karpushkin, Topology of the zeros of eigenfunctions, Functional Analysis and Its Applications, vol.19, issue.4, pp.59-60, 1989.
DOI : 10.1007/BF01079529

H. Lewy, On the Minimum Number of Domains in Which the Nodal Lines of Spherical Harmonics Divide the Sphere, Comm. Partial Differential Equations, vol.2, pp.12-1233, 1977.
DOI : 10.1007/978-1-4612-2082-4_34

J. Leydold, Knotenlinien und Knotengebiete von Eigenfunktionen, Diplom Arbeit, 1989.

J. Leydold, Nodal properties of spherical harmonics, Dissertation Universität Wien, 1993.

J. Leydold, On the number of nodal domains of spherical harmonics, Topology, vol.35, issue.2, pp.301-321, 1996.
DOI : 10.1016/0040-9383(95)00028-3

W. Magnus, F. Oberhettinger, and R. P. Soni, Formulas and Theorems for the Special Functions of Mathematical Physics, 1966.

F. Nazarov and M. Sodin, On the number of nodal domains of random spherical harmonics, American Journal of Mathematics, vol.131, issue.5, pp.1337-1357, 2009.
DOI : 10.1353/ajm.0.0070

J. Peetre, A generalization of Courant's nodal domain theorem., MATHEMATICA SCANDINAVICA, vol.5, pp.15-20, 1957.
DOI : 10.7146/math.scand.a-10484

?. A. Pleijel, Remarks on courant's nodal line theorem, Communications on Pure and Applied Mathematics, vol.31, issue.3, pp.543-550, 1956.
DOI : 10.1002/cpa.3160090324

I. Polterovich, Pleijel's nodal domain theorem, Proc. Amer, pp.1021-1024, 2009.

A. Stern, BemerkungenüberBemerkungen¨Bemerkungenüber asymptotisches Verhalten von Eigenwerten und Eigenfunktionen Inaugural-Dissertation zur Erlangung der Doktorwürde der Hohen Mathematisch-Naturwissenschaftlichen Fakultät der Georg August

A. Stern, BemerkungenüberBemerkungen¨Bemerkungenüber asymptotisches Verhalten von Eigenwerten und Eigenfunktionen, Diss. Göttingen, issue.30

G. Szegö, Orthogonal Polynomials. Fourth edition. Amer, Math. Soc. Colloquium Publications Amer. Math. Soc. Providence, R.I, vol.XXIII, 1975.