1. Advanced linux sound architecture (alsa): http://www.alsa-project.org/. (accessed 2015 January 08).
2. The CIPIC HRTF Database. online at: http://interface.cipic.ucdavis.edu/sound/hrtf.html.
3. Fast Fourier Transform West. http://www.fftw.org/. (accessed 2015 January 11).
4. Google's nexus 9. http://blogs.nvidia.com/blog/2014/10/17/nvidia-tegra-k1-google-nexus-9/(accessed 2015 January 11).
5. Listen HRTF database. online at: http://recherche.ircam.fr/equipes/salles/listen/index.html.