The article by Fam is devoted to the use of Wigner representation for the two-particle density matrix, which is outside the scope of our article. Moreover, in contrast to that article, we do not use an expansion of the equation for the Wigner distribution in powers of hbar. For both these reasons, we do not include a reference on this article 5.
The correction phi_Q was not discussed in the previous papers I know on the subject and I think that the paper must be published but, as explained below, important improvements are needed.