Hyperchaos synchronization with a zero driving variable

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For the first time an example of hyperchaos synchronization with a zero driving variable using the system's parameters changes, proposed by L.Zonghua and C.Shigang (Phys.Rev.E, 55, 6651 (1997)) is presented. Also it has been indicated that in the case of a single variable driving put forward by A.Tamasevicius and A.Cenys, Phys.Rev.E, 55, 297 (1997) such an approach allows one to avoid the threshold effect on the value of the parameter responsible for the "weight" (intensity) of nonreplica approach to the chaos synchronization proposed by M.Ding and E.Ott, Phys.Rev.E,49, R945 (1994).