1. V. Guillemin and M. Stenzel, Grauert tubes and the homogeneous Monge-Ampère equation, J. Diff. Geom.
34, 561–570 (1991).
2. V. Guillemin and M. Stenzel, Grauert tubes and the homogeneous Monge-Ampère equation. II, preprint (1990).
3. W. Klingenberg, Riemannian Geometry, Walter de Gruyter, Berlin (1982).
4. L. Lempert and R. Szöke, Global solutions on the homogeneous complex Monge-Ampère equation and complex structures on the tangle bundle of Riemannian manifolds, Math. Ann.
290, 689–712 (1991).
5. G. Patrizio and P. M. Wong, Stein manifolds with compact symmetric centers, preprint (1989).