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2. Stone skeleton or iron skeleton: the provision and use of metal in the construction of the Papal Palace at Avignon in the 14th century;Bernardi,2005
3. Metals in Antiquity;Beukens,1999
4. Le Maitre de la cathédrale de Beauvais;Branner;Art Fr.,1962
5. The Cathedral of Bourges and its Place in Gothic Architecture;Branner,1989