“…In the work of the Dahler group, kinetic equations were derived for the phase space density and these equations were solved by moment methods developed by Grad. [127] In the Cole, Evans and Hoffman works, [35] the transport properties were expressed as a time correlation function and the method of Ernst (developed for hard spheres) [104,105] was applied to transform the time correlation function expressions into distribution function schemes so that the usual Enskog factorizations and expansions could be made. For both the Dahler and the Ernst methods, the operating expressions for the evaluation of the transport coefficients are complicated and in the end, the relationship of the computed transport coefficients to the hard-sphere limit is not always clear.…”