Geodesic
On Complex Submanifolds Whose Grassmann Image Has Maximal Holomorphic Curvature
Matematičeskie zametki, Tome 81 (2007) no. 4, pp. 561-568.

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We show that if the holomorphic curvature of a complex Grassmann manifold in two-dimensional directions tangent to a nondegenerate Grassmann image of a nonsingular complex surface attains the maximal possible value along all directions, then the surface is a complex hypersurface.
Keywords: holomorphic curvature, Grassmann image of a complex surface, complex index of nullity, sectional curvature, normal curvature, normal connection, flat metric. 
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O. V. Leibina. On Complex Submanifolds Whose Grassmann Image Has Maximal Holomorphic Curvature. Matematičeskie zametki, Tome 81 (2007) no. 4, pp. 561-568. http://geodesic.mathdoc.fr/item/MZM_2007_81_4_a9/

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