Tanner, Heather J. (1992). Chibnall, Marjorie (ed.). "The Expansion of the Power...

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Tanner, Heather J. (1992). Chibnall, Marjorie (ed.). "The Expansion of the Power and Influence of the Counts of Boulogne under Eustace II". Anglo-Norman Studies - XIV.Proceeding of the Battle Conference 1991. The Boydell Press: 251-286. cited in Wikipedia, p. 255

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