[1] Bando S, Ohnita Y. Minimal 2-spheres with constant curvature in CPn. J Math Soc Japan, 1987, 3: 477–487

[2] Li H Z, Wang C P, Wu F E. The classification of homogeneous 2-spheres in CPn. Asian J Math, 2001, 5: 93–108

[3] Bolton J, Jensen G R, Rigoli M, Woodward L M. On conformal minimal immersions of S2 into CPn. Math Ann, 1988, 279: 599–620

[4] Chern S S, Wolfson J G. Minimal surfaces by moving frames. Amer J Math, 1983, 105: 59–83

[5] Chern S S, Wolfson J G. Harmonic maps of the two-sphere into a complex Grassmann manifold II. Ann Math, 1987, 125: 301–335

[6] Din A M, Zakrzewski W J. Classical solutions in Grassmannian -models. Lett Math Phys, 1981, 5(6): 553–561

[7] Li Z Q, Yu Z H. Constant curved minimal 2-spheres in G(2, 4). Manuscripta Math, 1999, 100: 305–316

[8] Jiao X X, Peng J G. Classification of holomorphic two-spheres with constant curvature in complex Grass-mann manifold G(2, 5). Differ Geom Appl, 2004, 20: 267–277

[9] Yang K. Complete and Compact Minimal Surfaces. Dordrecht: Kluwer Academic Publishers, 1989

[10] Ogiue K. Differential Geometry of Kaehler Submanifolds. Adv Math, 1974, 13: 73–114

[11] Jiao X X, Peng J G. On holomorphic curves of constant curvature in the complex Grassmann manifold G(2, 5). Acta Math Sci, 2011, 31B(1): 237–248