  We discuss an improper application of the Maxwell-Boltzmann theory to a very
unrealistic model. The authors of the original paper claim that a generalized
theory would solve a problem that really does not exists. This Comment was
submited to Physica A and was not accepted as it is. Although tecnically
correct, we mantain ours view that such kind of "elementary exercises" would
not deserve publication in any serious journal as Physica A.
