NLP4DL / AT4DL 2009:
Viareggio / Trento, Italy
Raffaella Bernardi, Sally Chambers, Björn Gottfried, Frédérique Segond, Ilya Zaihrayeu (Eds.):
Advanced Language Technologies for Digital Libraries - International Workshops on NLP4DL 2009, Viareggio, Italy, June 15, 2009 and AT4DL 2009, Trento, Italy, September 8, 2009.
Lecture Notes in Computer Science 6699 Springer 2011, ISBN 978-3-642-23159-9 
Janusz S. Bien:
Efficient Search in Hidden Text of Large DjVu Documents.
1-14
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