Bo Ling and Liu Yongping. Best restriction approximation of Sobolev classes by entire functions of exponential type.

Bo Ling and Liu Yongping. Optimal Recovery of Isotropic Classes of rth Differentiable Functions on R^d. To appear in Numerical Functional Analysis and Optimization. ( Full Text )

Bo Ling and Liu Yongping. Optimal recovery of isotropic classes of rth differentiable multivariate functions. To appear in BIT Numerical Mathematics. ( pdf )

Bo Ling and Yongping Liu. Optimal recovery of isotropic classes of twice-differentiable functions defined on d dimensional Euclidean space. Journal of Approximation Theory,  Vol.182, pages 83-91, 2014 June. (pdf)

Bo Ling and Yongping Liu. Best constants of harmonic approximation of some convolution classes associated with Laplace operator in d-variables. SCIENCE CHINA, Mathematics, Vol. 56 No. 2: 301–313, 2013. ( pdf )