Freeform Surface Design for a LED Based Collimating Lens
ZHANG Qiaosong, XU Chunyun, CHENG Haobo, TAM Hon Yuen
Imaging Science and Photochemistry . 2016, (1): 36 -42 .  DOI: 10.7517/j.issn.1674-0475.2016.01.036

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