Jiachen Lu, Yang Li, Kang Min Ok. "Five-Membered [C<sub>5</sub>O<sub>5</sub>]<sup>2<b>–</b></sup> Rings as Birefringence-Active Genes for Ultrabirefringent Crystals." Journal of the American Chemical Society (2025). https://doi.org/10.1021/jacs.5c12128