Observation of spectral lines in the exceptional GRB 221009A. - Zhang, Yan-Qiu; Xiong, Shao-Lin; Mao, Ji-Rong; Zhang, Shuang-Nan; Xue, Wang-Chen; Zheng, Chao; Liu, Jia-Cong; Zhang, Zhen; Wang, Xi-Lu; Ge, Ming-Yu; Yi, Shu-Xu; Song, Li-Ming; et al. (SCIENCE CHINA Physics, Mechanics & Astronomy, 2024)