Here is the book which was referred to hereafter, not that billig but looks exciting:
From Prof. David A. King Institute for History of Science Johann Wolfgang Goethe University D 60054 Frankfurt am Main
The Ciphers of the Monks. A Forgotten Number-Notation of the Middle Ages. David A. King Stuttgart: Franz Steiner, (Boethius, volume 44), 2001.
With indices. Hardcover, 506 pp. ISBN 3 515 07640 9 $143.00
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