1. AIS 20: Functionality Classes and Evaluation Methodology for Deterministic Random Number Generators. Version 1 (02.12.1999) (mandatory if a German IT security certificate is applied for; English translation). http://www.bsi.bund.de/zerti.z/zert/interpr/ais20e.pdf
2. AIS 31: Functionality Classes and Evaluation Methodology for Physical Random Number Generators. Version 1 (25.09.2001) (mandatory if a German IT security certificate is applied for; English translation). http://www.bsi.bund.de/zerti.z/zert/interpr/ais31e.pdf
3. Lect Notes Comput Sci;V. Bagini,1999
4. Lect Notes Comput Sci;M. Bellare,1997
5. Lucent Technologies, Bell Labs: Scientist discovers significant flaw that would have threatened the integrity of on-line transactions, press article at http://www.lucent.com/press/0201/010205.bla.html .