Zhu Y, Davis S, Stephens R, Meltzer PS and Chen Y (2008). “GEOmetadb: powerful alternative search engine for the Gene Expression Omnibus.” Bioinformatics (Oxford, England), 24(23), pp. 2798–2800. ISSN 1367-4811, http://dx.doi.org/10.1093/bioinformatics/btn520, http://www.ncbi.nlm.nih.gov/pubmed/18842599.