Oded Goldreich Michael Krivelevich Ilan Newman Eyal Rozenberg Hierarchy Theorems for Property Testing. 504-519 2009 APPROX-RANDOM http://dx.doi.org/10.1007/978-3-642-03685-9_38 conf/approx/2009 db/conf/approx/approx2009.html#GoldreichKNR09