1. Document analysis of PDF files: method, results and implications;Lovegrove,1995
2. Conversion of PDF documents into HTML: a case study of document image analysis;Rahman,2003
3. A system for converting PDF documents into structured XML format;Déjean,2006
4. A linear grammar approach to mathematical formula recognition from PDF;Baker,2009
5. AIDAS: Incremental Logical Structure Discovery in PDF Documents;Anjewierden,2001