Equilibrium thermodynamics and thermodynamic processes in nonlinear systemsV. N. Likhachev, T. Yu. Astakhova, W. Ebeling and G. A. VinogradovEur. Phys. J. B, 72 2 (2009) 247-256DOI: https://doi.org/10.1140/epjb/e2009-00317-x