  The entropy of the Viana-Bray model at zero temperature and external field is
calculated within the solution which takes into account only delta functions
for the global order parameter P(h). It is shown that such solution is
unsatisfactory both from the viewpoint of stability analysis and for not
reproducing the well known Sherrington-Kirkpatrick result in the large
connectivity limit thus pointing out the relevance of considering solutions
with continuous part in P(h) for such model and possibly related models.

Disordered Systems and Neural Networks