Tomáš Roubiček, Charles University and Czech Academy of Sciences, Prague, Czech Republic.
"""Summarizing, the book seems very well written and of interest to anyone who does research in the field of optimization, [..]."" Mathematical Reviews ""Although my acquaintance with the book can be measured in (few) weeks, I have already found it very useful and an almost mandatory source of information in the area it covers; this is due not only to the results it actually contains but to the extensive (and carefully commented) bibliography. It will be just as useful to anybody working in calculus of variations, control theory and measure solutions of partial differential equations."" Zentralblatt für Mathematik"