See also: Algorithms.

USEARCH and UCLUST algorithms
Edgar,RC (2010) Search and clustering orders of magnitude faster than BLAST, Bioinformatics 26(19), 2460-2461.
doi: 10.1093/bioinformatics/btq461

UCHIME algorithm
Edgar,RC, Haas,BJ, Clemente,JC, Quince,C, Knight,R (2011) UCHIME improves sensitivity and speed of chimera detection, Bioinformatics doi: 10.1093/bioinformatics/btr381 [PMID 21700674].

UBLAST algorithm
Edgar, RC (unpublished) /usearch

UPARSE algorithm
Edgar, R.C. (2013) UPARSE: Highly accurate OTU sequences from microbial amplicon reads, Nature Methods [Pubmed:23955772,  dx.doi.org/10.1038/nmeth.2604].