Elchanan Mossel Ryan O'Donnell Krzysztof Oleszkiewicz Noise stability of functions with low in.uences invariance and optimality. 21-30 2005 conf/focs/2005 FOCS http://doi.ieeecomputersociety.org/10.1109/SFCS.2005.53 db/conf/focs/focs2005.html#MosselOO05