1. Lect Notes Comput Sci;N. Barić,1997
2. Lect Notes Comput Sci;J. Camenisch,2000
3. Lect Notes Comput Sci;D. Chaum,1994
4. Lect Notes Comput Sci;D. Chaum,1990
5. D. Chaum, E. van Heijst, and B. Pfitzmann. Cryptographically strong undeniable signatures, unconditionally secure for the signer. Interner Bericht, Fakultät für Informatik, 1/91, 1990.