  We show the possible existence of compact stars having a surface composed of
a mixed phase of quarks and hadrons. This scenario can be realized both for
self-bound stars, satisfying the so-called Witten-Bodmer hypothesis, and for
gravitationally bound stars. This class of solutions of the
Tolman-Oppenheimer-Volkoff equation can be obtained in all the models we
discuss, within a physically acceptable range of values of the model
parameters.
