"Aachen Cathedral Treasury, Aachen, North Rhine-Westphalia, Germany. Grodecki, Louis, Florentine M�therich, Jean Taralon and Francis Wormald; Si�cle de l'An Mil, 950-1050, Paris: �ditions Gallimard, 1973"@en . . "Aachen Cathedral Treasury"@en . . "2015-07-16"^^ . "2015-07-16"^^ . . .