Danny Dolev Yuval Harari Nathan Linial Noam Nisan Michal Parnas Neighborhood Preserving Hashing and Approximate Queries. 73-85 2001 15 SIAM J. Discrete Math. 1 http://dx.doi.org/10.1137/S089548019731809X db/journals/siamdm/siamdm15.html#DolevHLNP01