Maxwell’s equal-area law for Gauss–Bonnet–Anti-de Sitter black holesA. Belhaj, M. Chabab, H. El moumni, K. Masmar and M. B. SedraEur. Phys. J. C, 75 2 (2015) 71DOI: https://doi.org/10.1140/epjc/s10052-015-3299-7