Mathematics.

• Gao Jia, Xiao-Ping Yang, Euler equations and approximations for the minimingers of Heisenberg target, Nonlinear Analysis, 67 (2007), 2690–2698.
• Gao Jia, Regularities and singularities of the energy minimizers of the Heisenberg groups targets, Acta Mathematics Scientia, 23, 4 (2003), 39–45.
• Gao Jia, Xiao-Ping Yang, Jinde Cao, The Holder continuities of the maps in $W^{1,p}(\Omega,\bold H^n)$, Appl. Math. And Comput., 149, 2 (2003), 507–518.
• Gao Jia, Xiao-Ping Yang,Some remarks about the Heisenberg group, J. of PDEs, 15, 3 (2002), 39–45.
• Gao Jia, Xiao-Ping Yang, BMO Spaces and John-Nirenberg Estimates for the Heisenberg Group Targets, J. of PDEs, 16, 3 (2003), 204–210.

• University of Shanghai for Science and Technology