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Many modern applications deal with complex data, where retrieval by similarity plays an important role. Complex data main comparison mechanisms are based on similarity predicates. They are usually immersed in metric spaces where distance functions are employed to express the similarity and a lower bound property is usually employed to prevent distance calculations. Retrieval by similarity is implemented by unary and binary operators. Most of the studies aimed at improving the efficiency ofdoi:10.3390/info9050124 fatcat:ix6dyzasebenridcib3jx2ifqq