Morse indices of Yang-Mills connections over the unit sphere

Nayatani, Shin; Urakawa, Hajime

Compositio Mathematica, Volume 98 (1995) p. 177-192

The first eigenvalue of the laplacian for a positively curved homogeneous riemannian manifold

Urakawa, Hajime

Compositio Mathematica, Volume 59 (1986) p. 57-71

Bounded domains which are isospectral but not congruent

Urakawa, Hajime

Annales scientifiques de l'École Normale Supérieure, Volume 15 (1982) p. 441-456