Could someone recommend an excellent book on optimal control theory for partial differential equations?

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I am a researcher in optimal control theory, particularly focusing on PDEs. I have extensively studied many of J-L Lions' excellent books in this field, as well as Fredi Tröltzsch's outstanding work. I am seeking additional insightful literature that could provide fresh perspectives and new ideas for my research. Could you kindly recommend some books that align with these interests? Thank you!