Anne Condon Joan Feigenbaum Carsten Lund Peter W. Shor Random Debaters and the Hardness of Approximating Stochastic Functions. 280-293 1994 conf/coco/1994 Structure in Complexity Theory Conference db/conf/coco/coco94.html#CondonFLS94 http://dx.doi.org/10.1109/SCT.1994.315796