1. Myslewski (2009) iPhone conquers half the (smartphone) world. The Register.
http://www.theregister.co.uk/2009/11/24/admob_mobile_metrics_report/
. Accessed 23 Jun 2015
2. Business Wire (2011) Research and markets: smartphones: a worldwide view—more than half of US handset shipments will be smartphones by 2012 and will move to 1 billion by 2015 Worldwide|Business Wire.
http://webcache.googleusercontent.com/search?q=cache:s8VgykeZ91sJ
:
www.businesswire.com/news/home/20110210005842/en/Research-Markets-Smartphones-Worldwide-View-Handset+&cd=1&hl=en&ct=clnk&gl=kr
. Accessed 23 Jun 2015
3. Li X, Ortiz P, Kuczenski B, Franklin D, Chong FT (2012) Mitigating the environmental impact of smartphones with device reuse. Sustain ICTs Manag Syst Green Comput 11:252–282. doi:
10.4018/978-1-4666-1839-8.ch011
4. IDC (2011) Estimates 50% growth in worldwide smartphone market in 2011|Mobile Marketing Watch.
http://mobilemarketingwatch.com/idc-estimates-50-growth-in-worldwide-smartphone-market-in-2011-14227/
. Accessed 23 Jun 2015
5. Lincoln JD, Ogunseitan OA, Shapiro AA, Saphores JD (2007) Leaching assessments of hazardous materials in cellular telephones. Environ Sci Technol 41:2572–2578