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"This is an excellent book, well organized and full of well-explained results and techniques on the subject. The proofs of the theorems are rigorous and well written, the arguments are presented in a clear and pleasurable way. The final section of each chapter ... provides information useful to a better understanding of the history of the results contained in the book. ... used as a textbook in an advanced course dealing with periodic solutions for second-order ordinary differential equations." (Addolorata Salvatore, Mathematical Reviews, 2017)