  Recently the non-extensive approach has been used in a variety of ways to
describe dense nuclear matter. They differ in the methods of introducing the
appropriate non-extensive single particle distributions inside a relativistic
many-body system, in particular when one has to deal both with particles and
antiparticles, as in the case of quark matter exemplified in the NJL approach.
I present and discuss in detail the physical consequences of the methods used
so far, which should be recognized before any physical conclusions can be
reached from the results presented.
