For citations of CD-HIT-OTU, please use the following papers:

1. W. Li, L. Fu, B. Niu, S. Wu & J. Wooley, "Ultrafast Clustering Algorithms for Metagenomic Sequence Analysis", Briefings in Bioinformatics, (2012) 13 (6):656-668. doi: 10.1093/bib/bbs035
2. S. Wu, Z. Zhu, L. Fu, B. Niu & W. Li, "WebMGA: a Customizable Web Server for Fast Metagenomic Sequence Analysis", BMC Genomics 2011, 12:444. PDF Pubmed Citations