Carlos Aguilar Melchor Yves Deswarte Single-Database Private Information Retrieval Schemes : Overview, Performance Study, and Usage with Statistical Databases. 257-265 2006 conf/psd/2006 Privacy in Statistical Databases http://dx.doi.org/10.1007/11930242_22 db/conf/psd/psd2006.html#MelchorD06