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Notes on Hildegard's "unknown" language and writing | Ferzoco, George | 2014 | |
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A new gloss on Hildegard of Bingen's "Lingua ignota" | Green, Jonathan P. | 2005 | |
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Die "Lingua ignota" der Hildegard von Bingen - eine Geheimsprache? | Hildebrandt, Reiner | 2002 |