The Isometry Groups of Manifolds of Nonpositive Curvature with Finite Volume. Takao Yamaguchi — 1985 Mathematische Zeitschrift
Lipschitz convergence of manifolds of positive Ricci curvature with large volume. Takao Yamaguchi — 1989 Mathematische Annalen
The isometry groups of riemannian manifolds admitting strictly convex functions Takao Yamaguchi — 1982 Annales scientifiques de l'École Normale Supérieure