Bounds for the spectral radius of block H -matrices. Zhang, Wei; Han, Zheng-Zhi — 2006 ELA. The Electronic Journal of Linear Algebra [electronic only]
A parameterized lower bound for the smallest singular value. Zhang, Wei; Han, Zheng-Zhi; Shen, Shu-Qian — 2008 ELA. The Electronic Journal of Linear Algebra [electronic only]