1. W. Adi, A. Al-Qayedi, A. Zarooni, A. Mabrouk, Secured multi-identity mobile infrastructure and offline mobile-assisted micro-payment application, in: IEEE Wireless Communications and Networking Conference 5(1) (2004) 879–882.
2. E. Brown, 1999. Micro-payment schemes promise to make the Web profitable – one penny at a time”, NewMedia, June 1997. Available from: .
3. Certificate chain discovery in SPKI/SDSI;Clarke;Journal of Computer Security,2001
4. X. Dai, B. Lo, NetPay – an efficient protocol for micro-payments on the WWW, in: Fifth Australian World Wide Web Conference, Australia, 1999.
5. Architecture of a micro-payment system for thin-client web applications;Dai,2002