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Chor, Benny, Niv Gilboa, and Moni Naor. \i Private Information Retrieval by Keywords\i0  In \i Technical Report\i0 . Technion: Israel Institute of Technology, Department of Computer Science, 1997.\par \par Chor, Benny, Oded Goldreich, Eyal Kushilevitz, and Madhu Sudan. "\i Private Information Retrieval\i0 ." In \i 36th Annual IEEE Symposium on Foundations of Computer Science\i0 . USA, 1995.\par \par }