1. [1] Average username length. http://www.eph.co.uk/resources/email-address-length-faq/.
2. [2] The Chromium projects design documents: Gpu accelerated compositing in chrome. http://www.chromium.org/developers/design-documents/gpu-accelerated-compositing-in-chrome.
3. [3] Delta color compression overview. http://gpuopen.com/dcc-overview/
4. [4] Discrete fourier transform. http://www.robots.ox.ac.uk/~sjrob/Teaching/SP/l7.pdf.
5. [5] Fast Fourier transform. http://mathworld.wolfram.com/FastFourierTransform.html.