Monuments of Romanesque Art; The Art of Church Treasures in North-Western Europe, Faber and Faber, 1974, ISBN 0-571-10588-2
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Goldschmidt, Adolph, Die Bronzetüren von Nowgorod und Gnesen, Marburg 1932, (Die frühmittelalterlichen Bronzetüren. 2)
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Their place of manufacture has been argued to be Hildesheim in Saxony, Bohemia, Flanders (perhaps Liege), or locally.
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