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Eigenvalue pinching and application to the stability and the almost umbilicity of hypersurfaces Grosjean J.-F., Roth J. Mathematische Zeitschrift 271, no. 1-2 (2012) 469-488 [hal-00170114 - version 3]

Hypersurfaces with small extrinsic radius or large $\lambda_1$ in Euclidean spaces Aubry E., Grosjean J.-F., Roth J. (12/11/2010) [hal-00516633 - version 2]

A pinching theorem for the first eigenvalue of the laplacian on hypersurfaces of the euclidean space Colbois B., Grosjean J.-F. Commentarii Mathematici Helvetici 82 (2007) 175-195 [hal-00095768 - version 1]

On the cohomology algebra of some classes of geometrically formal manifolds Grosjean J.-F., Nagy P.-A. [hal-00101996 - version 1]

The first eigenvalue of Dirac and Laplace operators on surfaces Grosjean J.-F., Humbert E. [hal-00095771 - version 1]

$p$-Laplace operator and diameter of manifolds. Grosjean J.-F. Ann. Global Anal. Geom. 28 (2005) 257-270 [hal-00137924 - version 1]

Minimal submanifolds with a parallel or a harmonic $p$-form. Grosjean J.-F. Journal of Geometry and Physics 51, 2 (2004) 211-228 [hal-00145758 - version 1]

EXTRINSIC UPPER BOUNDS FOR THE FIRST EIGENVALUE OF ELLIPTIC OPERATORS Grosjean J.-F. Hokkaido Math. J. 33, 2 (2004) 319-339 [hal-00145766 - version 1]