Petrina, E. D. and Petrina, D. Y. (1997) “Existence of equilibrium states of systems of hard spheres in the Boltzmann-Enskog limit within the frame work of the grand canonical ensemble”, Ukrains’kyi Matematychnyi Zhurnal, 49(1), pp. 112–121. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4990 (Accessed: 19May2024).