Equilibrium and nonequilibrium thermodynamics of a photon gas in the near fieldAgustín Pérez-Madrid, Luciano C. Lapas and J. Miguel RubiEur. Phys. J. Special Topics, 227 15-16 (2019) 2059-2067DOI: https://doi.org/10.1140/epjst/e2018-800053-9