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We analyze recent results on a Dirac oscillator. We show that the truncationof the Frobenius series does not yield all the eigenvalues and eigenfunctionsof the radial equation. For this reason the eigenvalues reported by the authorsare useless and the prediction of allowed oscillator frequencies meaningless.

Comment on: "On the Dirac oscillator subject to a Coulomb-type central potential induced by the Lorentz symmetry violation"