"2008-11-19" . "Associated References" . "2014-10-23" . . "DataSets/DataSet/Units/Unit/UnitReferences" . . . . "The recommended best practice is to separate the values with a vertical bar (' | '). Examples: \"http://www.sciencemag.org/cgi/content/abstract/322/5899/261\", \"Christopher J. Conroy, Jennifer L. Neuwald. 2008. Phylogeographic study of the California vole, Microtus californicus Journal of Mammalogy, 89(3):755-767.\", \"Steven R. Hoofer and Ronald A. Van Den Bussche. 2001. Phylogenetic Relationships of Plecotine Bats and Allies Based on Mitochondrial Ribosomal Sequences. Journal of Mammalogy 82(1):131-137. | Walker, Faith M., Jeffrey T. Foster, Kevin P. Drees, Carol L. Chambers. 2014. Spotted bat (Euderma maculatum) microsatellite discovery using illumina sequencing. Conservation Genetics Resources.\"." . "recommended" . "A list (concatenated and separated) of identifiers (publication, bibliographic reference, global unique identifier, URI) of literature associated with the Occurrence." . . .