Pedrosa, Glauco Vitor, Solange Oliveira Oliveira Rezende, and Agma Juci Machado Traina. " Reducing the dimensionality of the SIFT descriptor and increasing its effectiveness and efficiency in image retrieval via bag-of-features." Proceedings of the 18th Brazilian Symposium on Multimedia and the Web, São Paulo, 2012. SBC, 2012, pp.139-142.