State equation for dense gases and liquids from a self-consistent-field   approach
  The departure from ideal gas behavior is described by several known equations of state (EoS), developed from a combination of theoretical considerations and experimental correlations. In this work a different approach is proposed, in which from a pairwise potential of the Lennard-Jones type, interaction between molecules is accounted for by means of a self-consistent force field. An EoS is thus derived and compared to the Virial and to the van der Waals EoS. 
D. Giusti, V. Molinari, D. Mostacci
cond-mat.stat-mech