1. Android Codebase. https://source.android.com/source/. Android Codebase. https://source.android.com/source/.
2. Cisco wireless site survey FAQ. http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/68666-wireless-site-survey-faq.html#qa23. Cisco wireless site survey FAQ. http://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/68666-wireless-site-survey-faq.html#qa23.
3. Getting time from GPS on iOS. http://stackoverflow.com/questions/31920829/getting-time-from-gps-on-ios. Getting time from GPS on iOS. http://stackoverflow.com/questions/31920829/getting-time-from-gps-on-ios.
4. Is it possible to get the atomic clock timestamp from the iPhone GPS. http://stackoverflow.com/questions/1444456/is-it-possible-to-get-the-atomic-clock-timestamp-from-the-iphone-gps. Is it possible to get the atomic clock timestamp from the iPhone GPS. http://stackoverflow.com/questions/1444456/is-it-possible-to-get-the-atomic-clock-timestamp-from-the-iphone-gps.
5. NITZ functionality for non-3gpp devices. http://goo.gl/xQUECH. NITZ functionality for non-3gpp devices. http://goo.gl/xQUECH.