Group Signatures with Efficient Concurrent Join
Aggelos Kiayias and Moti Yung
Advances in Cryptology - EUROCRYPT 2005, 24th Annual International Conference on the Theory and Applications of Cryptographic Techniques, Aarhus, Denmark, May 22-26, 2005, Proceedings. Lecture Notes in Computer Science 3494 Springer 2005, pp. 198-214.