Time evolution of perturbations in quasi-Schwarzschild black holes Orival R. de Medeiros, Mateus Malato Corrêa and Caio F. B. Macedo Eur. Phys. J. C, 85 6 (2025) 683 Published online: 22 June 2025 DOI: 10.1140/epjc/s10052-025-14422-4