He has written a number of books about the comics medium as well, including Le monde d'Hergé (1983), published in English as Tintin and the World of Hergé (1988), a biography of Hergé, "Hergé, son of Tintin", a study of comics pioneer Rodolphe Töpffer, and theoretical works such as Lire la bande dessinée (1998)
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