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Homology of closed geodesics in a negatively curvaed manifold
      Journal of Differential Geometry 26(1987), 81-96(no.1). [88g:58149]
      (with Toshikazu SUNADA)
Closed orbits of an Anosov flow and the fundamental group
      Proceedings of American Mathematical Society 100(1987), 595-598(no.3). [88j:58094]
K\"ahler magnetic flows on a manifold of constant holomorphic sectional curvature
      Tokyo Journal of Mathematics 18(1995), 473-483(no.2)
Holomorphic helices in a complex space form
      Proceedings of the American Mathematical Society 125(1997), 1197-1202(no.4)
      (with Sadahiro MAEDA)
A comparison theorem for magnetic Jacobi fields
      Proceedings of the Edinburgh Mathematical Society 40(1997), 293-308(no.2)
Length spectrum of geodesic spheres in a non-flat complex space form
      Journal of the Mathematical Society of Japan 54(2002), 373-408(no. 2, April)
      (with Sadahiro MAEDA and Masakazu Yamagishi)
A characterization of isotropic immersions by extrinsic shapes of smooth curves [ciec]
      Differential Geometry and its Applications 26(2008), 307--312 (no.3)
      (with Tadashi SUGIYAMA)
Circular trajectories on real hypersurfaces in a nonflat complex space form,
    Journal of Geometry 96(2009), 41--55
        (with Bao TUYA)
A theorem of Hadamard-Cartan type for K\"ahler magnetic fields,

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      �u”÷•ª�Ï•ªŠwI -�”—ñ‚Ì‹ÉŒÀ‚Æ‚P•Ï�”ŠÖ�”‚Ì”÷•ª�Ï•ª�v ”|•—ŠÙ(1997)
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      �u”÷•ª�Ï•ªŠwII -‘½•Ï�”ŠÖ�”‚Ì”÷•ª�Ï•ª�v ”|•—ŠÙ(1998)
“ü–å�u‹` �üŒ`‘ã�”�@�։ؖ[(2007/11)
      (ŽRŠÝ�³˜a ‹¤’˜) [�Љîƒy�[ƒW]
Recent Progress in Differential Geometry and its Related Fields, World Scientific (2011/09)
      ‹´–{‰p�Æ, Milen J. Hristov ‹¤“¯•Ò’˜ [�Љîƒy�[ƒW]
�H‰È‚Ì‚½‚ß‚Ì�í”÷•ª•û’öŽ®�@�”—��HŠwŽÐ (2013/03)
Prospects of Differential Geometry and its Related Fields, World Scientific�@(2013/09)
      ‹´–{‰p�Æ, Milen J. Hristov ‹¤“¯•Ò’˜ [�Љîƒy�[ƒW]