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5. Brasseul, Jacques, Michel Herland, „Une énigme historique: la succession de l’esclavage antique et du servage médiéval“, Economies et sociétés – Cahiers ISMEA, Tome 43, no 7–8, juillet-août 2009, https://www.uqtr.ca/histoire/ documents/telechargement/H2015_LePromethe2WEB.pdf.