Zernike like functions on spherical cap: principle and applications in optical surface fitting and graphics rendering Zheng, Yi ; Wei, Kai ; Liang, Bin ; Li, Ying ; Chu, Xinhui Abstract Publication: Optics Express Pub Date: December 2019 DOI: 10.1364/OE.27.037180 Bibcode: 2019OExpr..2737180Z