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://epubs.siam.org/sam-bin/dbq/article/31809 db/journals/siamdm/siamdm15.html#DolevHLNP01