Etendue analysis and measurement of light source with elliptical reflector. - Xutao Sun; Zhen-Rong Zheng; Xu Liu 022; Peifu Gu (Displays, 2006)

Design of reflective projection lens with Zernike polynomials surfaces. - Zhen-Rong Zheng; Xutao Sun; Xu Liu 022; Peifu Gu (Displays, 2008)

Optimized design of LED freeform lens for uniform circular illumination. - Peng Liu; Reng-Mao Wu; Zhen-Rong Zheng; Haifeng Li 002; Xu Liu 022 (J. Zhejiang Univ. Sci. C, 2012)

Ray targeting for optimizing smooth freeform surfaces for LED non-rotational illumination. - Reng-Mao Wu; Peng Liu; Ya-qin Zhang; Zhen-Rong Zheng; Haifeng Li 002; Xu Liu 022 (J. Zhejiang Univ. Sci. C, 2013)