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The MI-File (Metric Inverted File) allows executing similarity searches on very large datasets. Detalis on the techhinqe can be found in "MI-File: using inverted files for scalable approximate similarity search", by Giuseppe Amato, Claudio Gennaro, and Pasquale Savino, published on Multimedia Tools and Applications:http://dx.doi.org/10.1007/s11042-012-1271-1and "Approximate Similarity Search in Metric Spaces Using Inverted Files", by Giuseppe Amato and Pasquale Savino, presented at Infoscale 2008: http://mi-file.isti.cnr.it/CophirSearch/MI-file.pdf.