1. UK hails 10th birthday of SMS, December 2002. The Times of India.
http://timesofindia.indiatimes.com/articleshow/30216466.cms
2. Americans sent 1 trillion SMS text messages in 2008.
http://www.intomobile.com/2009/04/06/americans-sent-1-trillion
3. 3GPP TS 03.40. Digital cellular telecommunications system (Phase 2+); Technical realization of the Short Message Service (SMS) Point-to-Point (PP)
4. TEKELEC (2007) SMS security: malicious attacks are just around the corner. Are you protected?
5. Androulidakis I (2009) Security in SMS. IT Security Professional Magazine 11:36–41