A Panoramic View of Riemannian Geometry
Marcel Berger
I. Domaines euclidiens, Invent. Math. 58 (1980), no. 2, 179-199. MR 82e:58097a
135. , Spectral geometrg: direct and inverse problems, Springer- Verlag, Berlin,
1986, With appendixes by Gerard Besson, and by Berard and Marcel Berger.