Whitepaper: Oracle Forensics Part 6 – Examining Undo Segments, Flashback and the Oracle Recycle Bin.
You can download it from the following link: https://packetstormsecurity.com/files/download/58653/oracle-forensics-6.pdf
Source: https://packetstormsecurity.com/files/58653/oracle-forensics-6.pdf.html