Quasinormal modes, stability and shadows of a black hole in the 4D Einstein–Gauss–Bonnet gravity R. A. Konoplya and A. F. Zinhailo Eur. Phys. J. C, 80 11 (2020) 1049 Published online: 12 November 2020 DOI: 10.1140/epjc/s10052-020-08639-8