1. Belaïd, A., Turcan, I., Pierrel, J.-M., Belaïd, Y., Rangoni, Y., Hadjamar, H.: Automatic indexing and reformulation of ancient dictionaries. In: International Workshop on Document Image Analysis for Libraries, pp. 342–354 (2004)
2. Gutenberg bible: In: Encyclopaedia Britannica, Chicago: Encyclopaedia Britannica (2010)
3. Gutenberg bible census: http://clausenbooks.com/gutenbergcensus.htm . Clausen Books
4. Le Bourgeois, F., Trinh, E., Allier, B., Eglin, V., Emptoz, H.: Document images analysis solutions for digital libraries. In: Proceedings of First International Workshop on Document Image Analysis for Libraries, pp. 2–24 (2004)
5. Agüera y Arcas B., Fairhall A.: Archaeology of type. Nature 411, 997 (2001)