The package allows the user to include several bibliographies covering different topics or bibliographic material into a document (e.g., one bibliography for primary literature and one for secondary literature). The package provides commands to include either all references from a .bib file, only the references actually cited or those not cited in your document. The user has to construct a separate .bib file for each bibliographic topic, each of which will be processed separately by BibTeX. If you want to have bibliographies specific to one part of a document, see the packages bibunits or chapterbib.