  The generalized Lyapunov exponents describe the growth of the second moments
for a particular solution of the quasi-1D Schroedinger equation with initial
conditions on the left end. Their possible application in the Anderson
transition theory became recently a subject for controversy in the literature.
The approach to the problem of the second moments advanced by Markos et al
(cond-mat/0402068) is shown to be trivially incorrect. The difference of
approaches by Kuzovkov et al (cond-mat/0212036, cond-mat/0501446) and the
present author (cond-mat/0504557, cond-mat/0512708) is discussed.
