Construct freeform surface directly in an initial layout of an off-axis reflective image system by seed curve extension and simulated annealing algorithmHongxiang Pan, Zhouping Su, Yangliu Zhang and Tao WuJ. Eur. Opt. Soc.-Rapid Publ., 16 1 (2020) 9DOI: https://doi.org/10.1186/s41476-020-00130-x
