Polarized radiative transfer of Kerr–Newman black holeXin Li, Sen Guo, Pei Wang, En-Wei Liang, Huan Deng, Yu Liang, Xiao-Xiong Zeng, Kai Lin and Qing-Quan JiangEur. Phys. J. C, 86 5 (2026) 461DOI: https://doi.org/10.1140/epjc/s10052-026-15683-3