1. Real Hypersurfaces in Hermitian Symmetric Spaces;Berndt,2022
2. Einstein Manifolds;Besse,2008
3. Contact Manifolds in Riemannian Geometry;Blair,1976
4. Two remarks on contact metric structures;Blair;Tohoku Math. J.,1977
5. On contact manifolds;Boothby;Ann. Math. (2),1958