Qingsong Ye Huaxiong Wang Josef Pieprzyk Xian-Mo Zhang Efficient Disjointness Tests for Private Datasets. 155-169 2008 ACISP http://dx.doi.org/10.1007/978-3-540-70500-0_12 conf/acisp/2008 db/conf/acisp/acisp2008.html#YeWPZ08