  The main results of the commented article do not raise objections, but their
final processing seems doubtful. Namely, the spectra of zero-field plasmon with
a fixed angular momentum $l = 0.1..4$ was scaled using a certain reference
frequency and, then displayed as a function of a specific screening parameter.
Oddly enough, it turned out that the reference frequency includes the screening
parameter explicitly. Obviously, it is a trivial error in scaling procedure.
For this reason the physical meaning of the result becomes lost, especially for
zero value of screening parameter. The similar scaling method was performed for
magnetoplasmon spectra at fixed values $0;0.5;\infty$ of screening parameter.
Again, the case of zero screening parameter is doubtful. Both examples are
exactly the source of misunderstandings. The original data for the axisymmetric
plasmon $l=0$ were corrected and, then compared with the that followed from
so-called telegraph line model, showing a difference of only 5 percent. We
claim that the telegraph line model would be useful for describing disk-shaped
plasmon devices with/without ring gratings.
