Nieves R. Brisaboa, Antonio Fariña, Oscar Pedreira, Nora Reyes. Similarity Search Using Sparse Pivots for Efficient Multimedia Information Retrieval. In Eigth IEEE International Symposium on Multimedia (ISM 2006), 11-13 December 2006, San Diego, CA, USA. pages 881-888, IEEE Computer Society, 2006. [doi]