1. Adobe Systems Inc. Pdf reference. www.adobe.com/devnet/pdf/pdf_reference.html. 2019.
2. Automatic transformation of multi-dimensional web tables into data cubes;Alrayes,2012
3. Tegra: Table extraction by global record alignment;Chu,2015
4. Recognition of tables and forms;Coüasnon,2014
5. Table content understanding in smartfix;Deckert,2011