On the uniqueness of isoperimetric solutions and imbedded soap bubbles in non-compact symmetric spaces, I. Wu-yi Hsiang; Wu-Teh Hsiang — 1989 Inventiones mathematicae
On the Construction of Codimension Two Minimal Immersions of Exotic Spheres into Euclidean Spheres. II. Wu-teh Hsiang; Wu-yi Hsiang — 1987 Mathematische Zeitschrift
On the existence of minimal hyperspheres in compact symmetric spaces Wu-teh Hsiang; Wu-yi Hsiang; Per Tomter — 1988 Annales scientifiques de l'École Normale Supérieure