This book covers developments in the field of the theory of oscillations from the diverse viewpoints, reflecting the field's multidisciplinary nature. Addressing researchers in mechanics, physics, applied mathematics, and engineering, as well as students, the book gives an introduction to the state of the art in this area and to various applications. For the first time a treatment of the asymptotic and homogenization methods in the theory of oscillations in combination with Pad approximations is presented. Because of its wealth of interesting examples this book will prove useful as an introduction to the field for novices and a reference for specialists.