F. Kassel and T. Kobayashi, Stable spectrum for pseudo-Riemannian locally symmetric spaces, C. R. Math. Acad. Sci. Paris 349 (2011), no. 1-2, 29-33, DOI: 10.1016/j.crma.2010.11.023..

Let X = G/H be a reductive symmetric space with rank G/H = rank K/KH, where K (resp.KH) is a maximal compact subgroup of G (resp. of H). We investigate the discrete spectrum of certain Clifford-Klein forms Γ\X, where Γ is a discrete subgroup of G acting properly discontinuously and freely on X: we construct an infinite set of joint eigenvalues for ''intrisic'' differential operators on Γ\X, and this set is stable under small deformations of Γ in G.

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