Yelash–Kraska chain + vdW attraction
The repulsion term of this EOS gives correct 2nd and 3rd virial coefficients and has its pole at a reasonable packing fraction. The attractive term has ben taken from the van der Waals EOS.
The calculation of volumes for given temperature and pressure leads to a quartic equation.
adjustable parameters: 3
 L. V. Yelash, PhD thesis, Development of equations of state for complex fluids, Fortschr.-Berichte VDI Reihe 3 Nr. 745, VDI Verlag, Düsseldorf 2000.
 L. V. Yelash, Th. Kraska, and U. K. Deiters, J. Chem. Phys. 110 (1999) 3079–3084.
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