@misc{cryptoeprint:1998:002,
    author = {A. De Santis, G. Di Crescenzo, O. Goldreich, and G. Persiano.},
    title = {The Graph Clustering Problem has a Perfect Zero-Knowledge Proof},
    howpublished = {Cryptology ePrint Archive, Report 1998/002},
    year = {1998},
    url = {http://eprint.iacr.org/1998/002},
}