  This note addresses the problem of computing fermion propagators in a broad
variety of strongly correlated systems that can be mapped onto the theory of
fermions coupled to an (over)damped bosonic mode. A number of the previously
applied approaches and their results are reviewed, including the conventional
diagrammatic resummation and eikonal technique, as well as the 'experimental'
higher dimensional bosonization and generalized (i.e., 'bottom-up' or
'non-AdS/non-CFT') holographic conjecture. It appears that, by and large, those
results remain either in conflict or incomplete, thereby suggesting that the
ultimate solution to this ubiquitous problem is yet to be found.
