Swastik Kopparty Shubhangi Saraf Tolerant Linearity Testing and Locally Testable Codes. 601-614 2009 APPROX-RANDOM http://dx.doi.org/10.1007/978-3-642-03685-9_45 conf/approx/2009 db/conf/approx/approx2009.html#KoppartyS09