Optical signatures of Einstein–Euler–Heisenberg AdS/dS black holes in the light of event horizon telescopeKhadije Jafarzade, Zeynab Bazyar, Sara Saghafi and Kourosh NozariEur. Phys. J. C, 85 8 (2025) 869DOI: https://doi.org/10.1140/epjc/s10052-025-14521-2