1. Qemu Snapshot patch, http://copilotco.com/mail-archives/qemu.2009/msg01213.html
2. Compare Snapshot Software, http://zairon.wordpress.com/2007/08/31/find-out-hidden-files-comparing-vmwares-snapshots/
3. Qemu Manual, http://wiki.qemu.org/
4. Qcow image format, http://people.gnome.org/markmc/qcow-imageformat.html
5. Hu, Y., Jin, H., Yu, Z., Zheng, H.: An Optimization Approach for Qemu. In: Information Science and Engineering (ICISE 2009) (2009)