1. J. Wang, T. Qian, Approximation of functions by higher order Szegö kernels I. Complex variable cases, Complex Variables and Elliptic Equations, 60 (6): 733-747, 2015. 2. J. Wang, T. Qian, Approximation of monogenic functions by higher order Szegö kernels on the unit ball and half space, Science China Mathematics, 57 (9): 1785-1797, 2014. 3. N. De Schepper, Tao Qian, F. Sommen, J. Wang, Holomorphic approximation of L2-functions on the unit sphere in R3, JMAA, 2014. 4. J. Liao, X. Li, J. Wang, Orthogonormal bases of the octonionic analytic functions, JMAA, 2010 5. Jinxun Wang, Xingmin Li, Jianquan Liao, The quaternionic Cauchy-Szego kernel on the quaternionic Siegel half space, arXiv:1210.5086
