Ahto Buldas Aivo Jürgenson Margus Niitsoo Efficiency Bounds for Adversary Constructions in Black-Box Reductions. 264-275 2009 ACISP http://dx.doi.org/10.1007/978-3-642-02620-1_19 conf/acisp/2009 db/conf/acisp/acisp2009.html#BuldasJN09