  Nowadays various estimates of Lyapunov dimension of Lorenz-like systems
attractors are actively developed. Within the frame of this study the question
arises whether it is possible to obtain the corresponding estimates of
dimension for the Chen and Lu systems using the reduction of them to the
generalized Lorenz system. In the work (Chen and Yang, 2013) Leonov's method
was applied for the estimation of Lyapunov dimension, and as a consequence the
Lyapunov dimension of attractors of the Chen and Lu systems with the classical
parameters was estimated. In the present work an inaccuracy in (Chen and Yang,
2013) is corrected and it is shown that the revised domain of parameters, where
the estimate of Lyapunov dimension is valid, does not involve the classical
parameters of the Chen and Lu systems.
