Optical appearance and shadow of Kalb–Ramond black hole: effects of plasma and accretion modelsMou Xu, Ruonan Li, Jianbo Lu, Shining Yang and Shu-Min WuEur. Phys. J. C, 85 6 (2025) 676DOI: https://doi.org/10.1140/epjc/s10052-025-14418-0