Shadow and quasinormal modes of the Kerr–Newman–Kiselev–Letelier black hole Farruh Atamurotov, Ibrar Hussain, G. Mustafa and Kimet Jusufi Eur. Phys. J. C, 82 9 (2022) 831 Published online: 21 September 2022 DOI: 10.1140/epjc/s10052-022-10782-3