New Closed Virial Equation of State for Hard-Sphere Fluids
  A new closed virial equation of state of hard-sphere fluids is proposed which reproduces the calculated or estimated values of the first sixteen virial coefficients at the same time as giving very good accuracy when compared with computer simulation data for the compressibility factor over the entire fluid range, and having a pole at the correct closest packing density. 
Jianxiang Tian, Yuanxing Gui, Angel Mulero
physics.chem-ph cond-mat.soft