Wang, F., Wang, F., & Wu, B. Pointwise characterizations of curvature and second fundamental form on Riemannian manifolds. Science China Mathematics, 61(8), pp. 1407-1420. doi:10.1007/s11425-017-9296-8

Wang, Feng-yu, Fengyu Wang, and Bo Wu. "Pointwise Characterizations of Curvature and Second Fundamental Form On Riemannian Manifolds." Science China Mathematics 61, no. 8 (): 1407-1420.

Wang, Feng-yu, Fengyu Wang, and Bo Wu. "Pointwise Characterizations of Curvature and Second Fundamental Form On Riemannian Manifolds." Science China Mathematics 61.8 (): 1407-1420.