Some Remarks on a Class of Submanifolds in Space Forms of Non-Negative Curvature. Kinetsu Abe — 1980 Mathematische Annalen
On a Generalization of the Hopf Fibration, III. (Subvarieties in the C-Spaces). Kinetsu Abe — 1985 Monatshefte für Mathematik
Isometric Immersions with the Same Gauss Map. Kinetsu Abe; Joseph Erbacher — 1975 Mathematische Annalen