1. Clarke, A., Concejero, P.: The digital divide–services for the elderly and disabled in 2010–the PRISMA project. In: 18th International Symposium on Human Factors in Telecommunication, vol. 2991, pp. 1–8 (2010)
2. Rogers, E.M.: Diffusion of Innovations, 4th edn. The Free Press, New York (1995)
3. Pew Research Internet Project Nearly half of American adults are smartphone owners (2013),
http://www.pewinternet.org/2012/03/01/nearly-half-of-american-adults-are-smartphone-owners/
(accessed on: Febuary 2014)
4. Fisk, A.D., Rogers, W.A., Charness, N., Czaja, S.J., Sharit, J.: Designing for Older Adults: Principles and Creative Human Factors Approaches. CRC Press J Taylor&.Francis Croup (2004)
5. Fisk, A.D., Rogers, W.A., Charness, N., Czaja, S.J., Sharit, J.: Designing for Older Adults: Principles and Creative Human Factors Approaches, 2nd edn. CRC Press J Taylor&.Francis Croup (2009)