The Lenz shift and wiener sausage in riemannian manifolds

Chavel, Isaac; Feldman, Edgar A.

Compositio Mathematica, Volume 60 (1986) p. 65-84

The first eigenvalue of the laplacian on manifolds of non-negative curvature

Chavel, Isaac; Feldman, Edgar A.

Compositio Mathematica, Volume 29 (1974) p. 43-53