%0 Journal Article %T Exact analytic expression for a subset of fourth virial coefficients of polydisperse hard sphere mixtures %A Ronald Blaak %J Physics %D 1998 %I arXiv %R 10.1080/002689798166693 %X We derive an exact, analytic expression for the fourth virial coefficient of a system of polydisperse spheres under the constraint that the smallest sphere has a radius smaller than a given function of the radii of the three remaining particles. %U http://arxiv.org/abs/cond-mat/9812097v1