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研究方向：代数拓扑
近期著作：
1. Compatible actions and cohomology of crystallographic groups. J. Algebra 320 (2008), no. 1, 341--353. (with A. Adem; J. Ge; N.Petrosyan)
2. Gerbes and twisted orbifold quantum cohomology. Sci. China Ser. A 51 (2008), no. 6, 995--1016.(with Y.B. Ruan; X.Q. Yin)
3. On the Fucík spectrum. J. Differential Equations 244 (2008), no. 10, 2498--2528. (with C.Li; S.Li; Z. Liu)
4. Gottlieb groups and subgroups of the group of self-homotopy equivalences. J. Korean Math. Soc. 43 (2006), no. 5, 1047--1063. (with J. Kim; N. Oda; M.H.Woo)
5. Toroidal orbifolds, Gerbes and group cohomology. Trans. Amer. Math. Soc. 358 (2006), no. 9, 3969--3983 (with A.Adem)
6. Rational homotopy theory and nonnegative curvature. Acta Math. Sin. (Engl. Ser.) 22 (2006), no. 1, 23--26.(with S.B. Wu)
7. Computing degree of maps between manifolds. Acta Math. Sin. (Engl. Ser.) 21 (2005), no. 6, 1277--1284.(with Y.H.Ding)
8. Secondary Brown-Kervaire quadratic forms and $\pi$-manifolds. Forum Math. 16 (2004), no. 4, 459--481. (with F.Q.Fang)
9. Homotopy localization and $H$-spaces. Bull. London Math. Soc. 34 (2002), no. 6, 677--680.
10. Phantom maps and injectivity of forgetful maps. J. Math. Soc. Japan 54 (2002), no. 1, 197--214. (with M.H.Woo)
11. Phantom elements and its applications. Groups of homotopy self-equivalences and related topics (Gargnano, 1999), 257--267, Contemp. Math., 274, Amer. Math. Soc., Providence, RI, 2001. (with M.H.Woo)
12. Exactness of G-sequences and monomorphisms. Topology Appl. 109 (2001), no. 3, 315--320. (with M.H.Woo)