Comment on "synchronization in a ring of four mutually coupled van der Pol oscillators: theory and experiment".
We have verified some results of Nana and Woafo [Phys. Rev. E 74, 046213 (2006)] in the area of the complete synchronization. We have found that the motion of the van der Pol network is quasiperiodic, not chaotic as the authors have written.
Perlikowski
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Division of Dynamics, Technical University of Lodz, Stefanowskiego 1/15, 90-924 Lodz, Poland.
Stefanski
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Kapitaniak
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