[[1] M. Berger, P. Gauduchon, E. Mazet, Le spectre d’une variété riemannienne, Lecture notes in Maths 194, Springer (1987).]Search in Google Scholar
[[2] M. P. do Carmo, Riemannian Geometry, Birkäuser, Boston (1992);10.1007/978-1-4757-2201-7]Search in Google Scholar
[[3] S. Gallot: A Sobolev inequality and some geometric applications, Spectra of Riemannian manifolds, Kaigai Publication, Tokyo (1983), pp. 45-55.]Search in Google Scholar
[[4] S. Gallot: Inégalités isopérimetriques, courbure de Ricci et invariants géométriques I, C. R. Acad. Sci. serie I, 296 (1983), pp. 333-336.]Search in Google Scholar
[[5] S. Gallot: Inégalités isopérimetriques, courbure de Ricci et invariants géométriques II, C. R. Acad. Sci. serie I, 296 (1983), pp. 365-368.]Search in Google Scholar
[[6] S. Gallot, D. Hulin, J. La Fontaine, Riemannian Geometry, Springer, Berlin (2007).]Search in Google Scholar
[[7] M. Gromov: Structures métriques pour les variétés riemanniennes, Textes Math. 1, Cedic-Nathan, (1981).]Search in Google Scholar
[[8] J. Hersch: Quatre propriétés isopérimétriques de membranes sphériques homogénes, C. R. Acad. Sci. Paris, 270 (1970), pp. 1645-1648.]Search in Google Scholar
[[9] F. Laudenbach: A Morse Complex for Manifolds with boundary, Geom. Dedicata 153 (2011), pp. 47-57.10.1007/s10711-010-9555-y]Search in Google Scholar
[[10] P. Li, S. T. Yau: Estimates of eigenvalues of a compact Riemannian manifold, AMS Proc. Symp. Pure Math. 36 (1980), pp. 205-240;10.1090/pspum/036/573435]Search in Google Scholar
[[11] D. Meyer: Minoration de la premiere valeur propre non nulle du problème de Neumann sur les variétés riemanniens à bord, Ann. Inst. Fouruer, Grenoble 36, 2 (1986), pp.113-125;10.5802/aif.1051]Search in Google Scholar
[[12] L. E. Payne and H. F. Weinberger: Lower bounds for vibration frequencies of elastically supported membranes and plates, J. Soc. Ind. Appi. Math. 5 (1957), pp. 171-182.10.1137/0105012]Search in Google Scholar
[[13] L. Sabatini: Estimation of Vibration Frequencies of Linear Elastic Membranes, Applications of Mathematics 63 (2018), pp. 37-53;10.21136/AM.2018.0316-16]Search in Google Scholar
[[14] P. Yang, S. T. Yau: Eigenvalues of the laplacian of compact Riemann surfaces and minimal submanifolds, Ann. Scuola N. Sup. Pisa 7 (1980), pp. 55-63]Search in Google Scholar