1. Bajarin, T. (2012): “6 Reasons Apple Is So Successful,” Time.
2. Google Completes Purchase of Motorola Mobility;BBC News,2012
3. Beaumont, C. (2008): “Apple's Jobs Confirms iPhone 'Kill Switch’,” The Telegraph.
4. Bessen, J.E. (2005): “Open Source Software: Free Provision Of Complex Public Goods,” SSRN eLibrary.
5. How Open Should an Open System Be?: Essays on Mobile Computing;Boudreau,2006