On thermodynamic stability of black holes. Part I: classical stability V. Avramov, H. Dimov, M. Radomirov, R. C. Rashkov and T. Vetsov Eur. Phys. J. C, 84 3 (2024) 281 Published online: 18 March 2024 DOI: 10.1140/epjc/s10052-024-12639-3