We discuss in some detail some of the drawbacks of PDF files obtained from mathematical papers prepared in TeX, particularly concerning indexing, copy/paste and OCR capabilities.
1. Mijajlović, Ž., Ognjanović, Z.: , In: Sojka, P. (ed.) Proceedings of DML 2008, Birmingham, UK, July 27th.
4. Baker, J.B., Sexton, A.P., Sorge, V.: , ibid, 75–79. Zbl 1176.68080