1. Techniques for data hiding;Bender;IBM Systems Journal,1996
2. ECMA-376 standard documentation, Office Open XML File Formats [Online]. Available from: http://www.ecma-international.org/flat/publications/Standards/Ecma-376.htm (accessed 18.08.15).
3. 7Zip program: http://www.7-zip.org/.
4. WinRAR program: http://www.rarlab.com.
5. X-G. Sui, H. Luo, A New Steganography Method Based on Hypertext, IEEE-2004.