The authors express their gratitude to many of their colleagues or former colleagues for their contributions to this work.

A special thanks goes to Hélène Beucher, Georges Blanc, Patrick Boisserpe, Sébastien Da Veiga, Lucie Dhorne, Mathieu Feraille, Véronique Gervais, Philippe Joseph, Didier Renard, Frédéric Roggero and Olga Vizika for their reviews, encouragements or help in editing the e-book files.