Jiaxian Wu(吴佳贤) and Yi-Hu Yang, Gradient estimates and Harnack inequality for a nonlinear parabolic equation on complete manifolds. Commun. Math. Stat., 2013. 1(4): p. 437-464.

Jiaxian Wu(吴佳贤), Ruan Qihua and Yi-Hu Yang, Gradient estimate for exponentially harmonic functions on complete Riemannian manifolds. Manuscripta Math. , 2014. 143(3-4): p. 483-489.

Jiaxian Wu(吴佳贤), Qihua Ruan， Yi-Hu Yang, Gradient estimates for a nonlinear diffusion equation on complete manifolds, Chinese Annals of Mathematics, Series B， DOI：10.1007/s11401-015-0927-0x