Morita equivalent symplectic groupoids, Seminaire sud Rhodanien a Berkeley, Symplectic geometry, groupoids, and integrable systems. appeared in Springer-MSRI Publications 20:291-311 (1991).
Morita equivalence of Poisson manifolds, appeared in Commun. Math. Phys. 142:493-509 (1991).
Symplectic groupoids of reduced Poisson spaces, appeared in C. R. Acad. Sci. Paris Serie I 314:457-461 (1992).
Morita equivalence and symplectic realizations of Poisson manifolds, appeared in Ann. Scient. Ec. Norm. Sup. 25:307-333 (1992).
Classical solutions of the quantum Yang-Baxter equation, (with A. Weinstein), appeared in Commun. Math. Phys. 148:309-343 (1992).
Poisson cohomology of regular Poisson manifolds, appeared in Ann. Inst. Fourier 42:967-988 (1992).
On quadratic Poisson structures, (with with Z.-J. Liu), appeared in Lett. Math. Phys. 26:33-42 (1992).
Poisson manifolds associated with group actions and classical triangular $r$-matrices, appeared in J. Func. Anal. 112:218-240 (1993).
A remark to Kuiper's theorem, appeared in Topology 32:353-361 (1993).
Noncommutative Poisson algebras, appeared in Amer. J. Math. 116:101-125 (1994).
Lie bialgebroids and Poisson groupoids, (with K. Mackenzie), appeared in Duke Math. J. 73:415-452 (1994).
Classical Intertwiner spaces and quantization, appeared in Commun. Math. Phys. 164:473-488 (1994).
On Poisson groupoids, appeared in International J. of Math. 6:101-124 (1995).
Exact Lie bialgebroids and Poisson groupoids, (with with Z.-J. Liu), appeared in Geom. and Functional Anal. 6:138-145 (1996).
Ping Xu, email@example.com