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A recent paper [1] (El Aroudi, 2012) misapplied a critical condition (Fangand Abed, 2001) to a well-known example. Even if the mistake is corrected, theresults in [1] are applicable only to buck converters and period-doublingbifurcation. Actually, these results are known in Fang's works a decade agowhich have broader critical conditions applicable to other converters andbifurcations. The flaws in [1] are identified.

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