On the Theoretical Gap between Group Signatures with and without Unlinkability.

Go Ohtake Arisa Fujii Goichiro Hanaoka Kazuto Ogawa On the Theoretical Gap between Group Signatures with and without Unlinkability. 149-166 2009 AFRICACRYPT http://dx.doi.org/10.1007/978-3-642-02384-2_10 conf/africacrypt/2009 db/conf/africacrypt/africacrypt2009.html#OhtakeFHO09