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机译:Biharmonic Submanifolds in a Riemannian Manifold with Non-Positive Curvature
Graduate School of Science and Engineering, Yamaguchi University, Yamaguchi, 753-8512, Japan;
Division of Mathematics, Graduate School of Information Sciences, Tohoku University, Aoba 6-3-09, Sendai, 980-8579, Japan;
Biharmonic map; Harmonic map; Isometric immersion; Minimal; Non-positive curvature;