  We analyze recently published results about the Aharonov-Bohm effect for
bound states from the interaction of the magnetic quadrupole moment of a
neutral particle with axial fields. We show that the eigenvalues obtained by
the authors from an arbitrary truncation of the Frobenius power series
correspond to more than one model and, consequently, are unsuitable for drawing
any sound physical conclusion. Besides, the prediction of allowed oscillator
frequencies is a mere consequence of the truncation condition just mentioned.
