  We prove the consistency of the different approaches for deriving the
black-hole radiation for the spherically symmetric case inside the theory of
Massive Gravity. By comparing the results obtained by using the Bogoliubov
transformations with those obtained by using the Path-Integral formulation, we
find that in both cases the presence of the extra-degrees of freedom create the
effect of extra-particles creation due to the distorsions on the definitions of
time defined by the different observers at large scales. This however does not
mean extra-particle creation at the horizon level. Instead, the apparent
additional particles perceived at large scales, emerge from the way distant
observers define their time coordinate, which is distorted due to the existence
of extra-degrees of freedom.
