1. Android developer reference,
http://d.android.com/
(accessed March 30, 2012)
2. Android security and permissions,
http://d.android.com/guide/topics/security/security.html
(accessed March 30, 2012)
3. Bitblaze,
http://bitblaze.cs.berkeley.edu/
4. Go Apk. Go apk market,
http://market.goapk.com
(accessed March 2011)
5. AppBrain. Number of available android applications,
http://www.appbrain.com/stats/number-of-android-apps
(accessed August 15, 2011)