Shirley Halevy Oded Lachish Ilan Newman Dekel Tsur Testing Properties of Constraint-Graphs. 2007 14 Electronic Colloquium on Computational Complexity (ECCC) http://eccc.hpi-web.de/eccc-reports/2007/TR07-054/index.html 054 db/journals/eccc/eccc14.html#HalevyLNT07