@misc{cryptoeprint:1998:004,
    author = {Giovanni Di-Crescenzo and Yuval Ishai and Rafail Ostrovsky},
    title = {Universal Service Providers for Database Private Information Retrieval},
    howpublished = {Cryptology ePrint Archive, Report 1998/004},
    year = {1998},
    url = {http://eprint.iacr.org/1998/004},
}