  Due to effect of Klein tunneling two-dimensional graphene quantum dots do not
possess genuine bound states but quasi-bound (resonant tunneling) states only.
We discuss in detail the attempt to describe these states within the framework
of the Dirac pseudo-fermion model for circular dot. We demonstrate explicitly
that introduced earlier the so called "resonance condition" corresponds to
inconsistent system of linear equations obtained from matching conditions on
the boundary of the quantum dot when one try to use it for complex energy
values and to the case of total reflection for the energies coincided with the
potential well top.
