I am deeply sorry for the author, who seems to be very knowledgeable about the subject, but I really regret having spent 9 euros for this unfinished text. I have read twenty-five pages but I've found several shells and two mistakes in French. Basic dates have been forgotten and style is sometimes too enumeration. One has the feeling that the text was dictated without being resumed. It seems that a new edition will be released soon, I hope the former will be withdrawn from sale.
Seeing the other comments I could not help but give my opinion to warn other readers.
