SOJKA, Petr and Radim HATLAPATKA. Document Engineering for a Digital Library: PDF recompression using JBIG2 and other optimization of PDF documents. Online. In
Proceedings of DocEng 2010 conference. Manchester, UK: ACM, 2010, p. 3-12. ISBN 978-1-4503-0231-9. Available from: https://dx.doi.org/10.1145/1860559.1860563.