1. Consumers reveal privacy concerns with loyalty programs, Convenience Store Decisions (2014). http://www.cstoredecisions.com/2013/10/28/consumers-reveal-privacy-concerns-loyalty-programs/.
2. One million fewer customer visits a week at tesco;Guardian,2014
3. White paper: An overview of the samsung KNOX platform, Accessed February 24, 2016. http://www.samsung.com/uk/business-images/insights/2015/An_Overview_of_the_Samsung_KNOX_Platform_V1.11-0.pdf.
4. How to date blind signatures;Abe,2002
5. Provably secure partially blind signatures;Abe,2000