R. Prasad and V. Sridhar, Optimal Number of Mobile Service Providers in India: Trade-Off between Efficiency and Competition, International Journal of Business Data Communications and Networking, vol.4, issue.3, 2008.

E. Balan, 600 Million Mobile Phone Subscribers in India: All by the end of 2011. http://news.softpedia.com/news/600-Million-Mobile-Phone-Subscribers-in-India- 54047, 2007.

P. Yammiyavar, Class notes, Course: Design Methods DD 504, 2007.

D. Katre, One-Handed Thumb Use on Smart Phones by Semi-literate and Illiterate Users in India, Workshop on Cultural Usability and Human Work Interaction Design, NordiCHI Conference, 2008.
DOI : 10.1007/978-3-642-11762-6_16

URL : https://hal.archives-ouvertes.fr/hal-01056242

P. Van and D. , Information Architecture for Designers, 2003.

D. Yeates, M. Shieldss, and D. Helmy, System Analysis and Design, 1996.