The concept of heresy in the Middle Ages (11th-13th C.) - Lourdaux, Willem; Verhelst, Danïel (Leuven Leuven university press, 1983)
Proceedings of the international conference Louvain May 13-16, 1973
Keywords: Christian heresies -- History -- Middle Ages, 600-1500 -- Congresses; Heresy -- History -- Congresses