1. Chen B-Y: Some pinching and classification theorems for minimal submanifolds. Arch. Math. 1993, 60: 568-578.
2. Chen B-Y: δ -Invariants, inequalities of submanifolds and their applications. In Topics in Differential Geometry. Ed. Acad. Române, Bucharest; 2008:29-155.
3. Deng S: Improved Chen-Ricci inequality for Lagrangian submanifolds in quaternion space forms. Int. Electron. J. Geom. 2012,5(1):163-170.
4. Hong Y, Houh CS: Lagrangian submanifolds of quaternion Kaehlerian manifolds satisfying Chen’s equality. Beitr. Algebra Geom. 1998,39(2):413-421.
5. Liu X: On Ricci curvature of totally real submanifolds in a quaternion projective space. Arch. Math. 2002,38(4):297-305.