  Currently it is being actively discussed the question of the equivalence of
various Lorenz-like systems and the possibility of universal consideration of
their behavior, in view of the possibility of reduction of such systems to the
same form with the help of various transformations. In the present paper the
differences and similarities in the analysis of the Lorenz, the Chen and the Lu
systems are discussed and it is shown that the Chen and the Lu systems are
valuable for the development of new methods for the analysis of chaotic
systems.

Chaotic Dynamics