Köroǧlu, H.Morgül, Ö.2016-02-082016-02-0820010022-0434http://hdl.handle.net/11693/24815We consider the quadratically optimal repetitive control problem in discrete-time and show that the existing zero-phase repetitive controller is quadratically optimal for stable plants. Copyright © 2001 by ASME.EnglishArticle