Variational Methods in Nonlinear Field Equations Solitary Waves, Hylomorphic Solitons and Vortices

“This book is a useful, enlightening, and thought-provoking
exposition of the research and findings over the last 35 years of using and
implementing variational techniques to better understand the dynamics of
nonlinear field equations. These reviewers would highly recommend this text be
on the shelf of any applied mathematician/physicist who uses variational
techniques to analyze nonlinear field equations.” (David J. Kaup and Thomas
Keith Vogel, Mathematical Reviews, November, 2015)