I would like to give my heartfelt thanks to all the real experts who have allowed me to consult them over the years. They include Christiane Mervaud, Patrick Nieirtz, Graham Gargett, Guillaume Metayer, Christine Guyot-Clément, but first and foremost, Bertram E. Schwarzbach, and Professor Emeritus Sylvain Menant, whose kind patience, comments, and suggestions for exploring various topics have been priceless.