1. G. Ateniese and G. Tsudik, Group signatures à la carte, ACM Symposium on Discrete Logarithms, (to appear) January 1999. Available at http://www.isi.edu/~gts/pubs.html .
2. G. Ateniese and G. Tsudik, A coalition-resistant group signature, available as ISI Technical Report at: http://www.isi.edu/~gts/pubs.html .
3. Lect Notes Comput Sci;D. Boneh,1998
4. S. Brands, An efficient off-line electronic cash system based on the representation problem, Technical Report CS-R9323, CWI, April 1993.
5. Lect Notes Comput Sci;S. Brands,1994